Updating agent on purchase order releases

 I have used PO_CHANGE_API1_S.update_po to update the promise date on open releases with success with launch workflow set to 'Y'--in the example from Oracle it indicated launch workflow set to 'N'--does this indicate that we should not lauch approval for updating the promise date?  Also, our end users want the ability to update the agent on all releases when we have personnel changes--can this be done without launching the approval workflow? .update_po to update the promise date on open releases with success with launch workflow set to 'Y'--in the example from Oracle it indicated launch workflow set to 'N'--does this indicate that we should not lauch approval for updating the promise date?  Also, our end users want the ability to update the agent on all releases when we have personnel changes--can this be done without launching the approval workflow?