Spare Sales order stealing stock from a Released production order

Question

Hi Gurus,
This is not a new problem. I read the below link only a hundred time now.
Sales order stealing components from Production order
Business scenario-
Top Assembly material - XYZ (Let's say Desktop PC), Proc type - E, Plng Strat - 40 (regular MTS scenario)
Sub Assembly material - ABC (Let's say Monitor), Proc type - F, Plng Strat - blank. But we sell this part sometimes (Let's say - customer wants an additional monitor).
Roy is a shop supervisor working on a $1 million Sales order for Top assembly XYZ which is already late and customer is screaming.
He released the production order with no missing parts, printed and fretting to finish this order.
After couple of hours of setup & machine prep - Roy went to pick up the parts and to his surprise material ABC is not available. 
Tina is at shipping department working on a $1000 Sales order that arrive today. System said 'sure you can ship it 3 days in advance'. So created a delivery and shipped it to the customer.
Now, Roy ran TCode: MB52 and found out that Tina just shipped his component ABC.
SAP gave the part ABC to a $1000 sales order and business lost sales on a $1 million order.
Please find the attachment for config screen shots TCode: OPJJ
Sales order Checking rule
Production order Release checking rule
Please help me resolve this issue.
Let me know if you need more info.
Thanks,

Answer 1

Praneeth,
There are two separate concepts here.  "How do I ensure that production orders and Sales orders are on an equal footing" and "what is the purpose of 'check without RLT'.
You have an ATP check relevant for Sales orders (checking rule "A" for Make To Stock).  You have an ATP check for production orders (I assume it is checking rule "PP").  If you want these two objects to have equal priority on stock and supplies, then make the two rules (OVZ9 for A and PP) identical.
Now, to RLT.
Prod Order Release has 'Check without RLT' active, that means - it'll let the sales orders (also that are outside the RLT) steal the stock.
Sales orders that are outside RLT will automatically confirm.  "Stealing" stock is a result of combination of the ATP for the sales orders, plus the ATP for the sales order delivery, combined with the ATP for production orders. and any ATP you may have on Goods Issues against a production order.  I cannot possibly tell you what you should do to prevent stealing stock, since there are so many permutations of scenarios that can affect the outcome.
I suggest instead that you give me concrete scenarios, telling me of specific problems, illustrated with screenshots of CO09, and I will help you through one or two specific scenarios.
Best regards,
DB49