Oracle Apex error ORA-01776: cannot modify more than one base table through a join view - oracle-apex

Question

I have an app in Oracle Apex 22.21. There are multiple tables (ORDERS, ORDER_ITEMS, STORES, and PRODUCTS).
ORDERS table
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I have a Master Detail report that is editable. The main report shows the ORDERS table and the detail shows the ORDER_ITEMS table.
Report image
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In the ORDERS table, there is a column STORE_ID which is a foreign key to the STORES table. The STORES table has a column STORE_NAME. I am able to edit the report (change the STORE_ID to another 'id' ex: 1,2,3) when the table's Source is set to the ORDERS table.
STORES table
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STORES table data
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I want the ORDERS table to include the STORE_NAME column referring to the STORES table. As it does not make sense for the user to enter a STORE_ID to edit a row. I want the user to be able to edit the STORE_ID by entering the STORE_NAME or by choosing an LOV. I changed the report Source Type to SQL Query and ran the below code.
select
ORDERS_LOCAL.*,
STORES.STORE_NAME
from ORDERS_LOCAL
inner join STORES
ON ORDERS_LOCAL.STORE_ID=STORES.STORE_ID
However, when I try to edit a cell, I encounter an error ORA-01776: cannot modify more than one base table through a join view
I've found a post/solution regarding this error and tried to follow the instructions. The first solution does not work in my case because I actually want the user to be able to edit the STORE_ID column by showing STORE_NAME.
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I've tried changing and running the PL/SQL code exactly as instructed but nothing saves when I change a cell value and click save. But I don't receive any error.
BEGIN
CASE :apex$row_status
WHEN 'C'
THEN
INSERT INTO stores (store_id, store_name)
VALUES ( :p10_store_id, :p10_store_name);
INSERT INTO orders_local (order_id,
order_number,
order_date,
store_id,
full_name,
email,
city,
state,
zip_code,
credit_card,
order_items
)
VALUES ( :p10_order_id,
:p10_order_number,
:p10_order_date,
:p10_store_id,
:p10_full_name,
:p10_email,
:p10_city,
:p10_state,
:p10_zip_code,
:p10_credit_card,
:p10_order_items);
WHEN 'U'
THEN
UPDATE orders_local
SET order_id = :p10_order_id,
order_number = :p10_order_number,
order_date = :p10_order_date,
store_id = :p10_store_id,
full_name = :p10_full_name,
email = :p10_email,
city= :p10_city,
state= :p10_state,
zip_code= :p10_zip_code,
credit_card= :p10_credit_card,
order_items= :p10_order_items
WHERE order_id = :p10_order_id;
UPDATE stores
SET store_name = :p10_store_name
WHERE store_id = :p10_store_id;
WHEN 'D'
THEN
DELETE orders_local
WHERE order_id = :p10_order_id;
DELETE stores
WHERE store_id = :p10_store_id;
END CASE;
END;

Answer 1

Take a step back. The "report that is editable" is an interactive grid. If the report is display only, then you can use any SQL to display data. However, if it is editable then the SQL statement is used to update the rows as well. The statement
select
ORDERS_LOCAL.*,
STORES.STORE_NAME
from ORDERS_LOCAL
inner join STORES
ON ORDERS_LOCAL.STORE_ID=STORES.STORE_ID
Cannot be used to update the store_id in the orders_local table. Currently you're trying to work around this by using custom code for the update but that is overcomplicating things. So, take a step back and restart.
The query for the interactive grid should be
select
*
from ORDERS_LOCAL
Define a List of Values to display the select list for Stores. The query for that list of values is
select
store_id as return_value,
store_name as display_value
from stores
In the interactive grid us this list of values for the store_id column.
That is all there is to it. This will allow you to use the native process for handling the IG updates.