Processing constraints in Order Management

Summery: IF my customer is equal to MRF and my item is equal to Apple it should throw error message through Processing constraints. Other than above customer and item it should not work the condition

Actual:

The above condition is applying for all the customers and items. How can we stop the process?

Content (required):

Version (include the version you are using, if applicable): R13

Code Snippet (add any code snippets that support your topic, if applicable):