This appears to be a new validation in Apex 5.04 that prevents the setting of Used: "only when current value in session is null" for items with a source of database column. Unfortunately this affects the following items: P15_SORT_ORDER, P17_TEST_CASE_ID, P17_TEST_DATA_ID, P18_PAGE_ID, P18_DATA_ATTRIBUTE, P18_SORT_ORDER, P18_OUTCOME_PAGE_ID.
As these pages reqire default values to be passed in the fix will need to be to create hidden items with values that can be set on the branch and use these as default values.
This appears to be a new validation in Apex 5.04 that prevents the setting of Used: "only when current value in session is null" for items with a source of database column. Unfortunately this affects the following items: P15_SORT_ORDER, P17_TEST_CASE_ID, P17_TEST_DATA_ID, P18_PAGE_ID, P18_DATA_ATTRIBUTE, P18_SORT_ORDER, P18_OUTCOME_PAGE_ID.
As these pages reqire default values to be passed in the fix will need to be to create hidden items with values that can be set on the branch and use these as default values.