Subcon PR ET not deleted by Optimizer in STH

Hi

Need  help on SNP Optimizer for subcon scenario please.

We intend Optimizer to delete the Subcon PR within the Stock Transfer Horizon. The settings are:

1. The material master does not have fix Stock transfer checked. and

2. The optimizer profile has stock transfer checked.

So I expected optimizer to not consider the orders in STH as fixed and delete old unfixed orders. Still its not deleting the old orders

Can you please suggest if I am missing something here.

Thanks in advance

RK