ASL and Sourcing rule is not creating releases

Hello All,

I have created

1. Local BPA with item A for supplier X, Site X

2. Local ASL with Supplier X, site X and assigned BPA created in above steps. Chose release method as "Automatic release/review".

3. Local Sourcing rule for Supplier X site X

4. in Assignment Set Assigned Sourcing rule to item A same as item in BPA

5. Assigned this Assignment set in MRP: Default sourcing assignment set.

Now, I created Purchase requisition in core form. Supplier and BPA is defaulted automatically But Release is not created automatically.

Kindly suggest me the route cause for this issue.

Thanks in advance.