Performing a GET with a Query Parameter on a Business Object

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I created a business object and subsequently used an OIC integration to populate (insert rows) the business object with data.  Now I am trying to GET rows back out of the business object where one of the fields (not the ID) has a specific value.   For example, one of the fields on the business object is messageClass and I would like to peform a GET using a query parameter where the messageClass is equal to a specified value.   The automatically generated endpoints for the business object does not support a GET in this manner.  Can a custom endpoint be configured for