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PMF Cannot Invoice SalesFormLetter_Invoice unpack() error

Hi All. I have an issue with PMF on both AX 6.0 and 6.1. The problem is after you click invoice button on sales order the following error occurrs. I do not get this problem on latest Contoso with Feb feature pack. I do get this problem on AX6.0 with PM installed and on a 6.1 upgraded from 6.0.

To correct the issues I revert back to the SYS layer for SalesFormLetter_Invoice.unpack(). I would of expected the SalesFormLetter_Invoice.pack() method to be the cause but the container looks to be packed correctly. Secodnly the pack() method does not get called, i put a break point here.

I am wondering what could be the cuase leading up to this issue. Any help woul dbe very much appreciated.

Thank you

SalesFormLetter_Invoice cannot unpack the serialized object. When I check the pack() method it looks to match unpack().

switch (version)

{

case #CurrentVersion :

[version, #ParmList, packedBase

//<PMF>

, pdsPackedClass

//</PMF>

] = _packedClass;

//<PMF>