How To Fix S_CUS_IMG_ACTIVITY203 - Table &1 in object &3 contains the non-maintainable key field '&2'

SAP Error Message - Details

• Message type: E = Error

• Message class: S_CUS_IMG_ACTIVITY - IMG Activity

• Message number: 203

• Message text: Table &1 in object &3 contains the non-maintainable key field '&2'

What causes this issue?

The table/view &V1& in object &V3& contains a key field ('&V2&') that
you cannot maintain in this table/ view.

System Response

You can use object &V3& in BC sets - with the exception of table/view
&V1&.
Fields that cannot be maintained (fields that do not have a suitable
foreign key dependency between its Basis table and the primary table of
table/view &V1&) are not supported by BC sets. If there are fields of
this type - as in this case - in the key area of a table/view, they
cannot be included in BC sets.

How to fix this error?

This is an incorrectly designed table/view &V1&. The design of the
table/view must be changed by the (SAP) developer responsible in the
Data Dictionary before the table/view can be used in BC sets. To do
this, either the affected field must be removed from the key, or the
Basis table of the field must be related to the primary table of the
table/view by using a suitable foreign key relationship. If a
maintenance dialog was generated for the table/view, then you must
regenerate it afterwards by using transaction SE54.
<ZH>Note:</>
To ensure that the change was successful, we recommend that you also
test the BC set functionality:
Create a BC set for the respective object.
Check whether the data was recorded completely in the BC set (SCPR3).
Change an entry in the respective object (SPRO or SM30/34).
Activate the BC set (SCPR20).
Check whether the values stored in the BC set were written correctly to
the table/view.

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

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.