Don't expect a SAP solution for a case where your purchasing department orders with an plain email and does not want to do any action in SAP.
And I still don't get the loop to a packaging and why you think packaging instructions could be used to solve this issue.
I can understand that your business case might be confidential but it is in this very specific case hard to imagine something meaningful if the case is explained so simplified and abstract .
But your story even gets more confusing with any new answer.
Look at this phrase: "we have a special vendor that procure specials kinds of materials for our production. According to our supplier sometimes these material numbers are changed or replaced according to our production, time, stock availability"
Usually we procure at a vendor, a vendor delivers. So it is confusing when you say that your vendor procures material.
The second sentence is also confusing, are the numbers changed because of your production or his production? And if it is his production, why do you bother at all, isn't the component still the same for you even your vendor differentiates it in more detail for his internal pleasure?
IF it is your production that requires changes in numbers, then why can't this be reflected in your system early enough that purchasing could procure the right items?
Why does the vendor decide what you need for your production?