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Using DLookup inside a user-defined function which is inside a query

Using DLookup inside a user-defined function which is inside a query
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Access gurus,
I am not sure if using DLookup inside a user-defined function and then
using that function inside a query is forbidden. When I did that, the
following error is encountered;

"Cannot open a form whose underlying query contains a user-defined
function that attempts to set or get the form's RecordsetClone

I never use RecordsetClone property in my code. Does anyone have any
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mySQL = "SELECT * FROM tblSKUMin_Max WHERE [SKU] = '" & vSKU & "';"
vMin = DLookup("SKUMin", mySQL, "[SKUClass] = '" & vStoreClass & "'")
vMax = DLookup("SKUMax", mySQL, "[SKUClass] = '" & vStoreClass & "'")
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