Solution : https://service.sap.com/sap/support/notes/359893 (SAP Service marketplace login required)
Summary :
When entering direct activity allocations in actual data through either Transaction KB21N or BAPI BAPI_ACC_ACTIVITY_ALLOC_POST, users encounter an error message BK128, indicating an incompatibility between the activity type and the business transaction. This issue generally arises despite the activity type having the appropriate category 1, due to a program bug linked to modifications of the activity type category during the fiscal year. The error message mistakenly references outdated activity type category information. To resolve this, users must apply the provided advance corrections.
Key words :
system issues error message bk128, additional key words saplk40c, error message bk128, attached advance corrections, affected activity type, direct activity allocation, activity type category, 'activity type &, program error, activity allocation
Related Notes :
| 129584 | Change activity type/delete activity type planning |