Quality notification - more reference objects

Question

Hello,
business need is to have quality notification with possibility to refer either production order or purchase order under one notification type.
By standard this seems not possible as:
Complaint Against Vendor references to Purchase order
Internal Problem Report references to Production order.
But in section "User-specific notification" is mentioned
A user-specific notification type has the same basic structure as the standard, predefined notification types. The screen layouts, reference objects, and tab indexes, however, may differ from those in the predefined notification types, depending on how you customize the user-specific notification type.
But I have not found a way in customizing to enable this.
Advice appreciated.
Br, Jan

Answer 1

Thanks for the asnwer, but I think this does not solve my problem.
In the configuaration for "Notification Header and Screen Areas" I do have
- notification header screen H500
- customized screen O550 (BADI)
and both are needed.
The BADI is used to customize refernce object screen, not reference documents screen. But my idea was to change reference document screen area in a way, that both purhcasing and production reference documents are visible in there.
I only managed to get the vendor screen by adding screen area 037 to "Extended View: Tabstrips and Screen Areas" But adding purhcase document as reference to Reference documents remains my problem.
I am kind of able to make the vendor screen visible by e.g. adding screen area 037 Partner overview screen (table control).But creating a new pop-up window for notification reference, where both options (pur ord, prod ord) would be available with copying functionality - in my opinion this requiers completely custom coding.