NAST table, VF31 and output determination

Hello,

I have an output type that has a requirement routine. 

When user creates the invoice using VF01, The NAST table creates an entry with processing status '0'.

The user then uses VF31 to process the output via smartforms.

My question:

Does VF31 while executing the output condition type, checks the requirement routine attached to it in the Output Procedure ?

If not, is there a way to ensure that VF31 checks the requirement routine.  Or how to reprocess the Output determination procedure.

Thanks.