LOV not working properly in my Custom Integrator

Trying to use an LOV  on the interface attribute definition. Does not give proper LOV list and allows the input of data not in the LOV.  This is table based.

I have created a custom integrator, defining the custom interface and trying to update an attribute.  These are my entries (for custom number)

Validation Type: table

ID Column: customer_number

meaning column: customer_number

Desc column: customer_name    (*** this does not work, does not appear)

validation_entity: ar_customers   (a view)

LOV type-- chose standard, but that did nothing, so changed it to POP lIst -- but only shows a small subset of the values and does not include the description.