Hi,
Sometimes when you want to find a text it may not appear on usage list results.
In those cases, you can use following transaction codes/reports to search string code blocks, including enhancements.
- Transaction EWK1 - Find text in code, including badi/enhancements
- Transaction CODE_SCANNER
- Report(SE38) RS_ABAP_SOURCE_SCAN
EWK1
CODE_SCANNER
SE38 : RS_ABAP_SOURCE_SCAN
Hope those are useful for you.