Enabling users to change Cost Centre at header

Hi there,

I'm trying to enable the functionality for users to change their cost centre when they're keying an expense claim, but at the same time limiting users to only one cost centre per expense claim.

I thought I could enable this functionality by setting the profile OIE:Enable Cost Center to Yes and in the Internet Expenses Setup and Administration responsibility setting the Cost Centre in the Chart of Accounts setup to Read-only.

When I try to change the Cost Centre on the General Information screen of keying an expense claim I get the following error:

     Account validation error: (Cost Centre name) invalid combination Cost Centre & Activity Element Please contact your system administrator to correct this error.