Project Accounting Distribution Error

I'm trying to Post an invoice on a Purchase order.    I go into the PO, go to Invoice, click invoice, click Post and it throws the error.  I have checked the accounting distributions and 100% are being distributed to a single account, so no funny business there.

These are the errors.  

Function ProjectAccountingDistribution::transactionCurrencySalesAmt has been incorrectly called.

Microsoft.Dynamics.Ax.Xpp.ErrorException: Exception of type 'Microsoft.Dynamics.Ax.Xpp.ErrorException' was thrown.
at Dynamics.Ax.Application.FormletterService.Run() in FormletterService.run.xpp:line 220
at Dynamics.Ax.Application.FormletterService.Postpurchaseorderinvoice(PurchFormLetterInvoiceContract _contract) in FormletterService.postPurchaseOrderInvoice.xpp:line 14
at FormletterService::postPurchaseOrderInvoice(Object , Object[] )
at Microsoft.Dynamics.Ax.Xpp.ReflectionCallHelper.MakeInstanceCall(Object instance, String MethodName, Object[] parameters)
at Dynamics.Ax.Application.SysOperationServiceController.Runoperation(Boolean _async) in SysOperationServiceController.runOperation.xpp:line 93
at Dynamics.Ax.Application.SysOperationServiceController.runServiceOperation(Object[] parameters) in SysOperationServiceController.runServiceOperation.xpp:line 22
at SysOperationServiceController::runServiceOperation(Object[] )
at Microsoft.Dynamics.Ax.Xpp.ReflectionCallHelper.MakeStaticCall(Type type, String MethodName, Object[] parameters)
at Dynamics.Ax.Application.SysDictClass.invokeStaticMethod(Object[] _params) in SysDictClass.invokeStaticMethod.xpp:line 26
at SysDictClass::invokeStaticMethod(Object[] )
at Microsoft.Dynamics.Ax.Xpp.ReflectionCallHelper.MakeStaticCall(Type type, String MethodName, Object[] parameters)
at Microsoft.Dynamics.Ax.Xpp.PredefinedFunctions.runAsInvoke(String className, String staticMethodName, Object[] parms, Object[]& exportInfolog)