Schedule Lines for TATX items

Question

I know that by default, schedule lines are not active for TATX (text) items in sales documents.
I'm also pretty sure that this option is not valid even if you activate it in the IMG.
Can anybody tell me:
1) Is my statement above correct ?
2) If so, why are schedule lines not allowed for TATX items.
3) Is there any way around this limitation ?

Answer 1

Thanks for your input so far.  Perhaps you'll be kind enouth to stick with me a little more.
Let me expalin what my user is doing:
In the IMG configuration of our system, schedule lines were activated for TATX item category, however it still does not work as expected.
User enters a quantity of deliverable product on line item 1 with item category of TAN.
User creates a delivery schedule for line item 1 using schedule lines (category CP).
For line item 2, user wants to send "DOCUMENTATION" for each schedule line.
"DOCUMENTATION" exists in our SAP system as a material master, but no stock exists.
User enters a quantity of DOCUMENTATION on line item 2 with item category TATX.
User creates delivery schedule for line item 2.  (auto populates sched category CT).
When delivery is created, the first schedule line for both items works fine.
For subsequent deliveries, line item 1 continues to work, but the line item 2, DOCUMENTATION material does not show up.
I suspect that we are trying to use the TATX item category differently than it was intended, and that some other method would be a better fit for making deliveries of non-stocked material.