purchase requisition(Customzing)

Hello User,

my problem is the Customizing from the purchase requistion.

I got a Workflow like this:

Now if i want to approve the Workitem i got this Exception:

My Customizing is:

In Release Groups my Rel. Grp is 01 with Rel.Obj. 1

Release Codes im using 'EX' and 'KY':

Release indicator:

Release Strategies my strategy is 'JS'

In 'JS':

- Release prerequisites:

- Release statuses

- Classification

- Release simulation

Workflow

So as you can see its all correct.

Now in 'Organization and Staffing (Workflow)'

I have spended 2 Days for this and i still got no solution.. a step by step intro would be good or you see the misstake.