How to change Region read only on runtime in Oracle APEX

 1: Make P6_REGION_ID

that will contain all Region available for your page 

use this code as source 

select 

PLUG_NAME,

ID

 from APEX_200200.wwv_flow_page_plugs

                    where FLOW_ID =:P6_FLOW_ID

                    and   PAGE_ID =:P6_STEP_ID

  and make process to update Region read only

 BEGIN

UPDATE APEX_200200.wwv_flow_page_plugs -- Region

SET PLUG_READ_ONLY_WHEN_TYPE = 'EXISTS' ,

    PLUG_READ_ONLY_WHEN = 'SELECT 1 from dual where 1 =2 '

WHERE FLOW_ID = :P6_FLOW_ID -- APP ID

 and PAGE_ID = :P6_STEP_ID  -- PAGE ID

 and ID = :P6_REGION_ID -- REGION ID

; end;

thanks