How to model alternative bottleneck resources in SNP

Hi all,

I do have a following case to model in SNP (and PPDS):

1. I have 2 resources (A & B) from which both are relevant for finite scheduling

2. There is a production step that can use either A or B or A&B resources for manufacturing

3. At the same time each resource can handle different production process (two orders) or both can handle same production process (one order); each can also run by it's own

Question: what's the best way to model it in PPM to reflect that both resources are relevant for finite scheduling? If I make it with 2 PPMs then I have no option to use both resources simultaneously. If I make it via alternative resource within PPM, then the non-primary one is not relevant for finite scheduling.

Thanks,

Marcin