Replication of partner function from ECC to CRM

Hi experts,

We are working on CRM 5.0 with back end ECC 6.0

In our scenario we are creating sales orders in ECC and replicating it to CRM.

Now the problem is we have a partner function created in ECC which is entered manually ( not through partner determination procedure) . We have also created the same partner function in CRM but we are not able to populate that partner function field automatically.

Is there any way by which we can populate this ?

Points will be rewarded for suitable solution.

Regards,

Madhu