The Description in the Free text invoice lines changes after the invoice is posted or when printing a Free Text Invoice in AX2012
The Description information does not go to the Free Text Invoice Report, what happens is that the Description writes itself to the Invoice Text field on the General Tab of Line Details on the Free Text invoice. Once there is data in that field filled in, the field does not change by changing the Description on the FTI line. However, if you change the data in the Invoice Text field on Line details, you will see that update on the Free Text Invoice Report and posted Journal:
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