SAP Note 10194 - Menu texts maintained by customers have disappeared

Symptom

When an add-on project is deactivated, menu texts
maintained by the customer are replaced by the SAP texts.

Solution
Advance correction:
In function module RS_CUA_MOD_DEACTIVATE, mark the line
FUN-LONGTEXT = FUN-SHORTTEXT.
with an asterisk (around line 390 in the source text).