Short dump while assigning transaction type to categorization schema

Hi,

I am configuring Defect Management in Solman 7.1 SP12.

I have created a categorization schema and have added categories under it.

In Application Areas assignment block, have chosen Application Id as Service Request/Incident.

However, while trying to select Parameter as Transaction Type/Catalog category, getting the following error:

Error: Field Symbol has not yet been assigned.

Kindly help.

Thanks,

Prasad