FMDERIVE When giving a 'constant' value f.i. for the field 'fund', it's not possible to overwrite

Hi,

To debar that nary worth is filled successful the tract 'FUND' we utilized a duty regularisation successful FMDERIVE with a 'constant' worth for that field. But, present we tin nary longer overwrite is with different value. Is determination a mode to marque it inactive 'overwritable' with different value?

Thanks,

Ruth