Service entry sheet cannot revoke acceptance

Dear All,

Service PO is created with four line items in Service tab in item details.

All are entered as short text i.e without service master record.

Three Service entry sheets are created for the first three items. But only one material document (with mvmt type 101) has been created for those three service entry sheets.

This material document contains these 3 line items with 3 service entry sheets as reference document.

For fourth line item in services tab of PO, fourth service entry sheet + material doc (101) created.

Also in PO history tab of PO, Three GR line items for first material document and Fourth GR line item for second material document displayed.

In PO history, Only fourth service entry sheet is diplayed.

Now when we want to revoke acceptance of one of the three SES (with common mat doc), system is not allowing. Its giving error message SE025 as below

Not possible to cancel acceptance immediately due to aggregation

Message no. SE025

Diagnosis

It is not possible to revoke acceptance due to aggregation of the PO history records.

Procedure

To revoke (cancel) acceptance of one or more entry sheets, you must first disaggregate the PO history records (report RM06EKBE).

But when report RM06EKBE is run, its not getting executed.

Please suggest how to revoke acceptance of those three SESs.

Thanks & Regards