FI-AA: Transaction Types at unplanned depreciation

Hello experts.

There is an issue with the transaction types while posting of an unplanned depreciation. Using transactions ABAA and AFAB I get different transaction types in the posting documents.

In transaction ABAA I use the TT 650 (field BWASL). After using transaction AFAB, the FI-document shows the TT 501 (field ANBWA).

For me it is now interesting, where these TT are linked to each other, I don't find any customizing-possibiltiy for this...

Thanks for your help...

Best regards

Roland