MM functional experts - query

Hi,
The requirement is not to use purchase requisition at all but to use purchase order directly.This needs to be linked to a workflow.
Also the approvals are required for PO's directly and not PR's.
In terms of the customzing, what changes are needed, also to override the settings for not using PR at all but only POs for approval, which user exit needs to be written, if at all.
In summary, workflow + PO without PR, how can this be done...Thanks a lot in advance.

Hi Hari,
Thanks for the answer, currently we need release strategy+workflow for direct PO approvals.
I need to know the following :
1.Some broad steps as to how this can be done, say STEP 1, customizing, STEP 2, user exit etc, that would be really helpfu to design such a requirement.
Also is this standard SAP, apart from customizing what changes in tech design/coding need to be done....to enable PO approval with workflow+release strategy.

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