SAP Note 18713 - Termination F1806 dur. reversal in foreign currency

Symptom:

When you reverse a document in a foreign currency, the update terminates with error message F1806 (System error: BSEG-PSWSL is not set in document & & & &). The error only occurs when the document for reversal was revaluated by program SAPF100.

Cause and prerequisites

Different program errors in Releases 2.2A - 2.2D and 3.0A - 3.0F

Solution
Corrected in Release 2.2E.
Advance correction:

Include MF05AI10

MODULE STORNOBELEGE_ERZEUGEN.
...

...
*------- Bewertungsdifferenzen merken ---------------------------------
KDFTAB-BUKRS = BSEG-BUKRS.
KDFTAB-GSBER = BSEG-GSBER.
KDFTAB-WAERS = BKPF-WAERS. <- INSERT
KDFTAB-SAKNR = BSEG-SAKNR.
KDFTAB-HKONT = BSEG-HKONT.
...
...
ENDMODULE.

Additional key words

FB08, POST_DOCUMENT, LF005U01