DLookUp And DMin Problem

S

Shell

Would you please tell me the problem of the following:

DLookUp("OrderQty","[Current_Purchasing_Order1]","[Current_Purchasing_Order1].PN='"&
Stock.PN &"' And
[Current_Purchasing_Order1].IssueDate='Dmin("IssueDate","[Current_Purchasing_Order1]","[Current_Purchasing_Order1].PN='"& Stock.PN &"'")'")
 
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