SAP Message UCT8259 - Cannot derive source selection for &1 from &2

Diagnosis
The method has a mapping rule that splits the value of source field &V1&and moves it into target field &V2&. The method attempts to derive thesource selection for source field &V1& from the target field &V2&, butfails.

System Response
The system cannot determine the source selection for source field &V1&.Thus, the system may read more source data than was originally intended,which can affect performance. If the source field is a time ch
aracteristic, the problem becomes critical.

Procedure
Check whether the split operation has the correct offset and the lengthin the mapping rule for target field &V2&. Also check whether the
Conversion Exit and Input Conversion indicators are setproperly.

  • If the Conversion Exit indicator is selected, the split uses the
    • external format of source field &V1&; otherwise, it uses theSAP-internal format of the source field.
    • If the Input Conversion indicator is selected, the split uses the

      • external format of target field &V2& to derive the values of field &V1&for the source selection; otherwise, it uses the SAP-internal format ofthe target field.

      Example
      You want to split the source field Fiscal Year/Period into the targetfields Fiscal Year and Posting Period. The internal format of the sourcefield is YYYYMMM (for example, 2006012), and the externalformat is MMM/YYYY (for example, 012/2006). For targetfield Fiscal Year you define a move from the source field with an offsetof 0 (zero) and a length of 4 (four), and you leave the Conversion Exitand Input Conversion indicators unselected. For target field PostingPeriod you define a move from the source field with an offset of 4(four) and a length of 3 (three), and here you also leave the ConversionExit and Input Conversion indicators unselected.
      Now you execute the method in fiscal year 2006 and posting period 12 (wh
      ich internally has the format 012). When deriving the sourceselection for the source field Fiscal Year/Period, the values 2006
      and 012 are combined to 2006012 (which reflects theinternal format of the source field).