I'd put this question in a forum if I could find one.
I have two issues:

• external charges seem to match every tax rate so I get multiple tax entries on an external charge invoice.
• I would really like to have one default tax rate for all products (and external charges) and then add more specific rates for specific products. I don't see how to configure this.

Thanks for any help

Hi I have been struggling for a few days with this issue and it seems like the plugin is calling some code that is not compatible with V20 of killbill
any idea how I could locally refactor this and work around it
java.lang.AbstractMethodError:
org.killbill.billing.plugin.easytax.api.EasyTaxInvoicePluginApi.priorCall
(Lorg/killbill/billing/invoice/plugin/api/InvoiceContext;Ljava/lang/Iterable;)
Lorg/killbill/billing/invoice/plugin/api/PriorInvoiceResult;
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.killbill.billing.osgi.ContextClassLoaderHelper$ClassLoaderInvocationHandler$1.execute(ContextClassLoaderHelper.java:144)
at org.killbill.commons.profiling.Profiling.executeWithProfiling(Profiling.java:33)
at org.killbill.billing.osgi.ContextClassLoaderHelper$ClassLoaderInvocationHandler.handleInvocation(ContextClassLoaderHelper.java:141)
at com.google.common.reflect.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:84)
at com.sun.proxy.$Proxy162.priorCall(Unknown Source)
at org.killbill.billing.invoice.InvoicePluginDispatcher.priorCall(InvoicePluginDispatcher.java:89)
at org.killbill.billing.invoice.InvoiceDispatcher.processAccountWithLockAndInputTargetDate(InvoiceDispatcher.java:525)
at org.killbill.billing.invoice.InvoiceDispatcher.processDryRun_UPCOMING_INVOICE_Invoice(InvoiceDispatcher.java:432)
at org.killbill.billing.invoice.InvoiceDispatcher.processAccountWithLock(InvoiceDispatcher.java:373)
at org.killbill.billing.invoice.InvoiceDispatcher.processAccount(InvoiceDispatcher.java:295)
at org.killbill.billing.invoice.api.user.DefaultInvoiceUserApi.triggerDryRunInvoiceGeneration(DefaultInvoiceUserApi.java:249)
at org.killbill.billing.util.glue.KillbillApiAopModule$ProfilingMethodInterceptor$1.execute(KillbillApiAopModule.java:76)
at org.killbill.commons.profiling.Profiling.executeWithProfiling(Profiling.java:33)
at org.killbill.billing.util.glue.KillbillApiAopModule$ProfilingMethodInterceptor.invoke(KillbillApiAopModule.java:92)
at org.killbill.billing.util.security.AopAllianceMethodInvocationAdapter.proceed(AopAllianceMethodInvocationAdapter.java:45)
at org.apache.shiro.authz.aop.AuthorizingAnnotationMethodInterceptor.invoke(AuthorizingAnnotationMethodInterceptor.java:68)
at org.killbill.billing.util.security.AopAllianceMethodInterceptorAdapter.invoke(AopAllianceMethodInterceptorAdapter.java:32)
at org.killbill.billing.jaxrs.resources.InvoiceResource.generateDryRunInvoice(InvoiceResource.java:417)
at org.killbill.commons.skeleton.metrics.TimedResourceInterceptor.invoke(TimedResourceInterceptor.java:69)
at org.killbill.billing.server.modules.JaxRSAopModule$JaxRsMethodInterceptor$1.execute(JaxRSAopModule.java:87)
at org.killbill.billing.util.entity.dao.DBRouterUntyped.withRODBIAllowed(DBRouterUntyped.java:57)
at org.killbill.billing.server.modules.JaxRSAopModule$JaxRsMethodInterceptor.invoke(JaxRSAopModule.java:82)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205)
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409)
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:558)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:733)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at com.google.inject.servlet.ServletDefinition.doServiceImpl(ServletDefinition.java:286)
at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:276)
at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:181)
at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:85)
at org.killbill.billing.server.security.TenantFilter.doFilter(TenantFilter.java:111)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at org.killbill.billing.server.filters.ResponseCorsFilter.doFilter(ResponseCorsFilter.java:75)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at ch.qos.logback.classic.helpers.MDCInsertingServletFilter.doFilter(MDCInsertingServletFilter.java:49)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:120)
at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:135)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.shiro.guice.web.SimpleFilterChain.doFilter(SimpleFilterChain.java:44)
at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
at org.apache.shiro.guice.web.SimpleFilterChain.doFilter(SimpleFilterChain.java:41)
at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)
at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.codahale.metrics.servlet.AbstractInstrumentedFilter.doFilter(AbstractInstrumentedFilter.java:111)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
at org.apache.catalina.valves.rewrite.RewriteValve.invoke(RewriteValve.java:279)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)