When try to run T-code SHD0 to create/change Transaction Variant of ME5*N (ME51N, ME52N, ME53N), find the fields in item overview cannot be customized.
"Item overview as grid control" flag is set in Personal Settings of ME5*N (ME51N, ME52N, ME53N). Since only the predefined fields can display in the table control (not grid control).
Please un-select "Item overview as grid control" flag in Personal Settings of ME5*N.
Related notes / content:
1885057 SHD0 : The fields in item overview of T-code ME5*N (or ME2*N) cannot be customized