How to ignore programmatically some items during a query ?

Hi all,
The process of my application is like this : first of all the end-user enters some criteria , then he/she presses a button to search for the possible results matching the criteria entered (execute_query). The possible results are displayed through a multirecord based datablock.
The criteria screen has two parts , say part_a and part_b. When the end-user does not enter any criteria in part_b then the datasource of the results block should be a table , say data_source_1 ; and if some criteria are entered in part_b then the datasource of the results block should be a view , say data_source_2.
The datasource data_source_1 has less number of columns than the datasource data_source_2 , but all of data_source_1's columns are included into data_source_2.
So my problem is when the datasource of the results block is set to data_source_1 then there are unknown columns when executing the query (alert error). All of the columns of data_source_2 are included in the results block , and all of the columns of data_source_1 are automatically there because mathematically speaking data_source_1 is included into data_source_2.
I have tried to use in the pre-query trigger of the results block this statement : set_item_property('results_possibles.column_a',queryable,property_false); but the same error still occurs.
So how to ignore these items ?
Thank you very much indeed.

After looking at what you did to try to solve the problem, I'm not sure what the actual problem is.
You can make both datasources have the same number of columns by selecting nulls:
data_source_1: select a, b, c, null as d, null as e from <table>
data_source_2: select a, b, c, d, e from <view>
If you have a field which is used to query a column which is included in data_source_2 but not in data_source_1, and that field is populated when you run the query, then just set the block's default_where to ignore that field.
eg
data_source_1: where...and c like nvl(:control.c,'%')
data_source_2: where...and c like nvl(:control.c,'%') and d like nvl(:control.d,'%')...

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