The name custTable_1 has already been assigned to another variable in Dynamics AX 2012

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Dynamics-AX

Development platform = Dynamics AX 2012, CU3

How do I solve this problem with my display method:

display invoiceDate InvoiceDate()
{
     CustInvoiceJour custInvoiceJour;
     CustTable       custTable_1;
            
     CustTable custTable_1 = CustTable::find('1').InvoiceAccount; //pass the customer account number
     

 select maxDate(INVOICEDATE) from CustInvoiceJour
              where custInvoiceJour.InvoiceAccount == custTable_1.InvoiceAccount;  
         
    
     return custInvoiceJour.invoiceDate;
}

When compiled it give an error message:
The name custTable_1 has already been assigned to another variable.

I tried renaming the CustTable table name to custTable and received a "Datasource arlready exists" error message when compiled.

I am trying to return the latest Sales Invoice Date when a customer record is selected in the Customer Profile form.