FM Activation while Running with Other SAP Modules

Hi

We are implementating FM BCS Mdule in Year 2014 with profile 101, GR and IR update.

Now the current settings which we did are running correctly for 2014 year postings

But

Open Purchase Order - Purchase Created in 2013 but GR is coming in 2014

Error : System is consuming the budget in 2014 when we do GR in 2014.

Solution which we explored : We have Run FMN4N PO Recontruction Program. but system is not seleccting the Purchase orders in this Transaction.

Alternative solution which we explored : Reassignment of Account Assignment Eements.

we will create the new derivation rule to derive the Dummy commitment items for old PO's

and through FMCN and FMCT we will assign in PO's.

can anybody help on the otther approaches to be followed on this.

Thanks in Advance

SAM.