Record_Status is 'Changed' After Post_Query Trigger

Record_Status is 'Changed' After Post_Query Trigger due to which is keeps asking to Save record while closing the form having no changes.

Here is Post_Query Trigger

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IF :xxhil_om_sanction_budget.ou_id IS NOT NULL THEN

  select distinct  parm_ou_name 

  into :xxhil_om_sanction_budget.NBT_ORG_CD               --NON DB ITEM

  from XXHIL_OM_ORG_V

  where parm_ou_id= :xxhil_om_sanction_budget.ou_id;

END IF;

IF :xxhil_om_sanction_budget.item_id IS NOT NULL THEN

    select  segment1

    into :xxhil_om_sanction_budget.NBT_ITEM_NAME          --NON DB ITEM

    from mtl_system_items_b