Create a Sandbox So You Can Edit Service Mappings
You must use a sand box when you edit a service mapping. If you access the Manage Service Mappings page outside of a sand box, then the page disables the actions you need to edit the mapping, such as Add Row.
Try it.
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            Go to the Sandboxes work area. 
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            On the Sandbox page, click Create Sandbox. 
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            On the Create Sandbox page, set the value. Attribute Value Name Enter any text. For this example, enter Sandbox for Pricing Administration. 
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            Add a check mark to the Manage Service Mappings tool, then click Create and Enter. 
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            Go to the Pricing Administration work area, then edit your service mapping. A yellow banner displays at the top of the page to indicate that you're in the sandbox.   
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            At the top of the page, click Sandbox for Pricing Administration > Publish.