Purchase Requsition workflow - Approver selection

[Sathish Venkatesan]

Hello all,

We are in the process of implementing Purchase Requisition Overall Release workflow.
There are 3 levels of Approval and the client wants each level approver to select next level approver
till its finally released. Also approver details are maintained in a custom table instead of org chart.
Thinking of having a custom method after each level of Approval\release to select the next approver.
 
But the real concern for me is the user who is creating the purchase requisition wants to select the 
first level approver immediately after creating purchase requisition. Thought of having a select agent 
activity in the first step of the workflow and assign wf initiator to that task,  but they don't want to go
SAP Inbox and select the agent either. 

Is there a way, so that a pop-up can be raised to select a approver immediately after creating a purchase requisition?
Also client does not like express workitem after purchase requisition creation. Let me know if any user exit can be used.
We are in SAP 46C (Patch level 47).

Thanks!

Sathish Venkatesan
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