SAP Note 26505 - Syntax error in RK1Uxxxx, include FCXALF10

Symptom:

The transactions KEU1, KEU2, KEU3, KEU5 terminate with a syntax error in program RK1Uxxxx (xxxx - operating concern), include FCXALF10:
Field "WACOST" unknown...

Cause and prerequisites

Due to a change, the includes FCXALF10 and MKGALFAD are inconsistent.

Solution
Please include the following correction into the include MKGALFAD. The inserted lines are marked with "<--.

Additional key words

RK1US001