KB artikkel 2585384 og 978857 uddyber problemet og angiver løsning. Vejledningen er tilgælgelig for kunder med opdateringsabonnement og adgang til CustomerSource via disse link:
In Microsoft Dynamics NAV, when you apply a posted sales credit memo to a posted sales invoice manually, you notice that only half of the Tax amount is credited. However, when the Copy Document feature is used to create the credit memo, then the Tax amount is credited correctly.
This problem occurs in the following products:
https://mbs2.microsoft.com/Knowledgebase/KBDisplay.aspx?scid=kb$en-us$2585384&wa=wsignin1.0
Consider the following scenario in Microsoft Dynamics NAV:
In this scenario, incorrect VAT entries are generated. The following fields of the VAT entries contain incorrect amounts:
This problem occurs in the following products:
https://mbs2.microsoft.com/Knowledgebase/kbdisplay.aspx?scid=kb,en-us,978857