Schedule agreement Workflows

Hi Expert,

When i  create the Schedule Agreement (SA), following workflows stared in out box my business workplace.

Workflows for release of scheduling agreement Create time.   

Purchase Order (PO)

Workflow:

  20000075 

Identifier: 

wf_po_rel 

Schedule Agreement

Workflow:

  20000078 

Identifier: 

wf_pa_rel 

But i expected in here released only  Workflow:   20000078  .

I already checked business object in workflows, it's also correct BUS2013 -  20000078, BUS2012 -  20000075.

I am using two difference release strategy for PO and SA . But I used same release group for both PO and SA.

And SA release strategy classification characteristic also correctly assigned. 

Dear expert Where is wrong configurations can be happen, Please could any one assist me  ?