Assign RFx transaction type to hierarchy template

Is it necessary to assign RFx transaction type to hierarchy template even if I am not using service procurement ?

SPRO - > SRM Server -> CABS -> Service proc-> Activate Service Procurement : if i remove the assignment of RFx transaction type with the hierarchy template , I get error while creating Rfx : 'Hierarchy template not assigned to process type'.

In case I do assign the template to Rfx , I get error when I create follow-on contract based on the accepted bid. The error I get is "Contract must have same hierarchy template as RFx".

Please help !!