Solution : https://service.sap.com/sap/support/notes/422291 (SAP Service marketplace login required)
Key words :
SAPscript editor, F4 help, text retrieval, RSTXTCAT, report variant, SAP&SHORT_SEL
Related Notes :
438813 | RSTXTCAT variant SAP&EXTEND_SEL: blank fields |
13719 | Preliminary transports to customers (note for customers) |