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Changing M-D to Lookup

I have a custom object that is in a M-D relation to Account.  I want to change it to a Lookup.  There is no Roll-up on Account for this object yet I cannot change the Field Type.  The only thing I notice is that the Account field on the Custom Object is indexed.  Would this cause a problem? 

Any ideas?
If there is a cross object Workflow Field Update defined for the child object to update a record on the parent then you can't change the master detail into lookup field relationship. Cross object field updates only work on master detail relationship. In this case it is necessary to delete the cross-object field update to permit the Master-detail field type to be changed.
Perfect! Worked like a charm