Solution : https://service.sap.com/sap/support/notes/509580 (SAP Service marketplace login required)
Key words :
condition returns varying results depending, character-type abap data types, char data type semantics, relevant char data type, ddic char type, final wildcard character, problematic search patterns, cluster tables behave, fixed field length, desired results
Related Notes :
| 1011573 | Unexpected subscreen for coding block |
| 984477 | |
| 945044 | Transaction PE02 does not recognize decision operations |