Scope of work SC/PO in SRM

Hi,

The requirement is that you have a server reapir needed and you are not sure about the amount of labor and also amount for any spares?

So I need to create a SC and release against a Contract, for example I have a contract with IBM for their servers with both Service lines and Spares lines.

I could think of creating a limit item SC, say for $1000 and released against this contract with IBM. And it created a PO in ECC with Item Category D

Then, the work is performed and I tried to create a confirmation in SRM with line one with Serice and Labor for $300 and line two with spare parts of $700.

But I couldn't confirm against any material line as the PO is purely Service.

So, my question in general is, I am pretty sure many big companies might have faced this scenario in procurement of unknown amount of goods and services on one PO/SC.

What is the easier/other option to do this.

I know that we can't create two limit item PO's and more over, one line should be for materials.

Please share your input on this.

Thanks,

CS