Service condition types not adopted in SES and MIRO

Dear Experts,

PO is raised for materials w.r.t RFQ. Buyer knows the freight charges and is entering in PO as condition type which PO allows. PO check is maintained in such a way that no of line items in PO must match the RFQ and PR. When freight or packing& forwarding charges are intimated by supplier, it can be amended in PO as condition type and it does not affect the line items. so GR and MIRO isnt affected.

When we raise PO for Services, similar condition type is added such as Engineer idle charges or maintenance charges which can be known only after the service is completed by Engineer. These additional charges can be amended in PO but issue comes only when doing SES or MIRO where these are not captured. Only when these are added as separate line items in PO , will the SES or MIRO is possible.

Kindly guide me how to solve this issue???

Regards

Dhinesh