MIRO for Sch Agreement (LPA) without GR indicator

Hello All,

My Client would like to use new functionality of entering Service Items in Scheduling agreement (LPA). They do not want to use GR but only wish to do IR. Somehow the line items cannot be listed in MIRO. After analysis we informed client its mandatory to maintain Delivery schedule for these lines unless until MIRO cannot be done for those line items. Has anybody tried this out that Invoicing for such SA's can be done without maintaining Delivery schedules. I just want to be confirmed on this part before writing to SAP

Thanks and Regards

Suhel