Carry out sourcing

Hi all

I am new to SRM.

We are having an  issue:

Shopping cart is created in srm

under define sourcing for product category we have maintained:

category id      sourcesyst                                             sourcing

300002                   SEDCLNT203(this is our r/3 system)      sourcing always carry out

even though the SC are created i search it in  carry out sourcing, and i find it and after i assigned a vendor to my sc and i click on next button but when i want to created PO in trancaction type i have this error: No transaction types available in SAP SRM

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pls guide me with this issue.

Thanks,

Elham