Check Box functionally lost when visiblity is turned off then back on

Please pardon my attempt to ask a coherent question for I am new to Oracle Forms!
I have created a canvas using the layout wizard against an Oracle table. I needed to provide the means to select mulitple records for DELETION; so, I created a check box item beside the database items to allow the ability to select records to delete. I also allow the user to query this table in query mode against a couple of columns to help isolate records to be deleted. So far, I have gotten the expected functionality from the check box on the initial query of this form.
Now, heres my problem!
When I try to reduce the query result while in "ENTER_QUERY" (F7) mode, I intentionally make my check box item invisible. The thought being "I should not allow users opportunity select records for deletion while in the process of querying the table to fetch the records you will be deleting from!" Once I press F8 to execute the my query, I issue the following statements in my KEY-EXEQRY trigger:
set_item_property( 'EFIS_EMAIL_QUEUE.SELECTTODELETE', VISIBLE, PROPERTY_TRUE );
set_item_property( 'EFIS_EMAIL_QUEUE.SELECTTODELETE', ENABLED, PROPERTY_TRUE );
My results are displayed along with the check box to select records for deletion!
At thsi point, the functionally of the check box no longer works!
I get a forms error "(FRM-40200) Field is protected against update."
I look in the Property Palette under the Physical section and the Visible attribute is set to "Yes"!
Can someone tell me why turning the visible attribute "OFF*" and then back "*ON*" caused the lost functionity?*
What must I do to get this functionally back without abandoning this design premise?+
Is there some other attribute settings I must reset in addition to the two set_item_property issued above?+
Thanks in advance!
Les

Add to your code following statement
set_item_property( 'EFIS_EMAIL_QUEUE.SELECTTODELETE', UPDATE_ALLOWED, PROPERTY_TRUE );
and hopefully that should take care of your problem.

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