2976063 - APD error: "The field name <FIELDNAME> in the data target is not valid" [RSAN_WB010]

You have an APD with a process step to write data into a dataStore object. In the 'Target Area' of this process you have selected the type 'Overwrite Part of the DataStore Object'. If you push the 'Check' button in the APD you get the following error:

"The field name <FIELDNAME> in the data target is not valid"
Message no. RSAN_WB010

The APD has worked well in the past. The error happens after a BW 7.5 upgrade to at least SP16.

SAP NetWeaver 7.5

Analysis Process Designer, RSAN_WB 010, CX_RSAN_MDL_MAPPING=>TARGET_FIELD_NOT_ASSIGNED , KBA , BW-EI-APD , Analysis Process Designer , Problem