How To Fix UCT8259 - Cannot derive source selection for &1 from &2

SAP Error Message - Details

• Message type: E = Error

• Message class: UCT8 - Message class for UCT8(mapping)

• Message number: 259

• Message text: Cannot derive source selection for &1 from &2

What causes this issue?

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 the
source selection for source field &V1& from the target field &V2&, but
fails.

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
characteristic, the problem becomes critical.

How to fix this error?

Check whether the split operation has the correct offset and the length
in the mapping rule for target field &V2&. Also check whether the
<LS>Conversion Exit</> and <LS>Input Conversion</> indicators are set
properly.
If the <LS>Conversion Exit</> indicator is selected, the split uses the
external format of source field &V1&; otherwise, it uses the
SAP-internal format of the source field.
If the <LS>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 of
the target field.
&example&
You want to split the source field Fiscal Year/Period into the target
fields Fiscal Year and Posting Period. The internal format of the source
field is <AB>YYYYMMM</> (for example, <AB>2006012</>), and the external
format is <AB>MMM/YYYY</> (for example, <AB>012/2006</>). For target
field Fiscal Year you define a move from the source field with an offset
of 0 (zero) and a length of 4 (four), and you leave the Conversion Exit
and Input Conversion indicators unselected. For target field Posting
Period 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 Conversion
Exit and Input Conversion indicators unselected.
Now you execute the method in fiscal year 2006 and posting period 12
(which internally has the format <AB>012</>). When deriving the source
selection for the source field Fiscal Year/Period, the values <AB>2006
</> and <AB>012</> are combined to <AB>2006012</> (which reflects the
internal format of the source field).

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.