Diagnosis
During execution, the method derives the source selection for source fie
ld &V1& from the mapping rule for the target field. &V2& is one of thevalues that were derived for the source selection. The sys
tem requires that this value is in the external format because theConversion Exit indicator has been selected in the move operator forfield &V1&. However, the value &V2& is incompatible with the externalformat.
See also the other message issued along with this message, which provide
s detailed information about the error.

System Response
The system cannot derive the source selection for source field &V1&. Bec
ause of this, the system might read more data than was originallyintended. This can lead to performance issues.

Procedure
Examine the mapping rule used by source field &V1&. Examine theConversion Exit indicator in the move definition, in particular. If &V2&is indeed in the SAP-internal format, you should deselect theConversion Exit indicator.