How to setup sourcing rule for make,B2B item to check the availability from onhand before gen WO

The business case as below:

There is one item: SKU A which is a Make and Back to back item.

When there is a SO, the orchestration will go to Back to back flow and generate supply work order.

After complete the WO and SKU A is produced, the SO ship out the finish product. ( I can setup this flow without problem)

However, in some exceptional case, there maybe some SKU A reminding in the inventory (eg. excess production, cancellation of SO)

Is it possible to revise the flow above such that the sourcing rule will first check the inventory onhand before generate the Work order ?