ADO and the Data Control

I'm converting an app from DAO to ADO. A form has a data control that is set to a recordset, as...

Code:

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Set rsLevelTbl = PROJ_DB.OpenRecordset("SELECT AcctL1 AS ID FROM tblLevel;")
Set Data1.Recordset = rsLevelTbl

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This always worked fine in DAO. Now with ADO, I've changed the code to...

Code:

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rsLevelTbl.Open sSQL,PROJ_DB, adOpenKeyset, adLockPessimistic
Set Data1.Recordset = rsLevelTbl

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Now, I get a "Type Mismatch" error. What gives? Thanks.