Forms :: SYSTEM.BLOCK_STATUS Remains On Query

The form is used to insert new customers into a table on the database, but also, it is used to QUERY the table, by using a customer_id entered by the user to see the details for a customer.

The scenario is that for a particular field on the table, CUSTOMER_ID, I want to conceal the data on this field ONLY when I do a QUERY.I got this to work by using the below in the POST-QUERY trigger on the block.

IF :SYSTEM.BLOCK_STATUS = 'QUERY' THEN
SET_ITEM_PROPERTY('CUSTOMER_ID',CONCEAL_DATA,PROPERTY_TRUE);
END IF;

However, after I do a QUERY, and I decide to INSERT a NEW customer into the table, I click on the button to do a NEW insert into the database, and when typing in the CUSTOMER_ID, it is still concealed and I cannot see what I am typing.

This shouldn't happen as I only want the data to be hidden/concealed when doing a query, but I do want to see the data I am typing into the field when I am doing a new Insert.