Multiple Class assignment in PO release startegy configuration

Hi

We have a release class in place for standard purchase orders which is based on characteristics, document type and PO Net Value in document currency.(CEKKO - GNETW)

We are now working on implementing invoice plan solution for which we want to have a release class for framework purchase order which will be based on characteristics, document type and PO Net value in order currency(MEPO1235 - VALUE01).When we create a new class with these characteristics and try to assign to a new release group we get a message "Please check release classes". I understand that system will not allow to add multiple classes for the purchase order document.

Wanted to know if any of you had faced this issue and found a way out to get the same working.

Thanks

Harikesan