After you Schedule a Purchase request Bundling Run, you would notice that it did not pick few Purchase requests
SAP Business ByDesign
All PR's that has Account assignment as Service order are excluded by default while bundling of PR's through Run.
We request you to manually bundle and order or Define Automatic Creation of Purchase Orders for all such Purchase categories used in PR’s
We have discussed with our developers and they informed that in one of the future release they will remove the restriction "Excluding: Equal to 117 - Service Order"
However we request you to submit an idea via Customer influence Forum:
KBA , AP-PRP , Purchase Request Processing , How To