The SFC configuration tool now includes the Issue purchased materials and Issue produced materials options. You can use them to choose whether materials can also be issued from purchase lines or from production.
If you do not select these options, SFC only allows you to issue materials from stock. When materials are issued, only stock lines will be visible.
If the 'Purchase' and/or 'Production' setting is activated, the issue form also allows you to specify issues with the origins selected here.