When try to Create a Receipt with Receipt Method: Credit Card, click on Select Instr. get error

Hi there,

Implementing iReceivables.

Created Receipt Class, etc. and then by using DocID: 553614.1 did a Dummy setup for Credit Card Funds Capture Processing.

2.) Per Doc.1540904.1 Created a Trx. for the Customer who has an Active Credit Card on record.

3.) Selected the Instrument on the Trx.

4.) Created a Receipt thru Receipts WB with Payment Method: Credit Card, for the Trx. created on above 2.) 

5.) Keyed-in the 'Customer Number' or 'Trans Number' fields , click on "Select Instrument" button.

           GET ERROR==> "An attempt has been made to enter a null value into a column that requires data. Please correct to ensure that only valid values are entered for the column".