There isn't a direct field. You could link the item master table in the browse and display pt_mstr.pt_iss_pol (issue policy).
If you didn't want to do that, by inference you identify items that are issued before rel/print and insert a calculated field to indicate iss = no, but that inference would get lost when other components are issued.
Personally I'd go for the first option.

You could also use the op number. As the parts are not issued anyway the field is really irrelevant to these parts. So you could set this up on the BOM as op = 999999. That would then get copied onto the WOD when you release the W/O (or explode it). Then just add this column into your browse

Component Quantities and Costs are calucalted per Operation/WorkCenter combination.
The warehouse needs to pick components per WerkOrder for a specific Operations/WorkCenter (Machine Group).
I wanted to avoid to browse the pt_mstr but it seems I have little choice.
I have to include pt_iss_po to display the components (picked or floorstock) per workcenter.
Thank you all for the thoughts.