Account Assignment Category values are not displayed in the drop down box

Hi SRM Guru's

I am new to SRM. I got an issue in SRM portal.

SRM Portal: Under Purchasing->Purchase order overview. we can view the list of purchase order's(PO). In order to search a particular PO we use Quick Criteria Maintenance. In this selection criteria we have Account Assignment Category as an optional Dropdown field for selecting the PO's based on acc assignment category. But this Account assignment category dropdown field is not displaying any values.

While debugging i found that the values are imported from cluster table. During this fetch, values for Acc Assignment Category are not fetched.

Kindly help me on where to maintain the values.

Thanks in Advance.

Regards,

Kamal