Solution : https://service.sap.com/sap/support/notes/1396930 (SAP Service marketplace login required)
Key words :
make test step description unlimited, symptom test step description, test step description, call transaction se11, call transaction we31, call transaction sm30, change idoc segment, - change component type, component type, change domain
Related Notes :
1395274 | PC3.0 Support Pack 5 - Master Note |
1387118 | PC2.5 Support Pack 10 - Master Note |