How do I get Item Level text from PO ME21N Prior To Saving The PO?

Question

I saw this asked a few times but no solution so I will ask again.
Imagine that you are creating a PO in ME21N. You have some Header Level Text and then imagine you have 2 items in this PO. Each of these two items has Item Level Text.
Once a PO is saved, I know how to use Read_Text to get the texts for the header and items. You simply pass which text you want (ex. F01) the PO number and the language and it returns the texts for the header. For item level you combine PO number and Item number you want in the Name parameter of Read Text (example 112233445500010) then tell it which text you want (ex F01) and that is how it knows which item you want the text for.
However: When the user is first creating the PO, they want to see how it will look in printing but prior to actually saving the PO. They dont want to save the PO until they know how it will print with Print Preview.
I was very surprised that the print preview actually worked for the Header Texts prior to saving. I debugged Read_Text and see that when it sees no PO number passed, it simply supplies the text (F01) and the language and pulls it out of an FM READ_CATALOG which I am assuming is memory. In theory, you will only have one F01 text at the header level and it makes sense to me that it is able to retrieve that.
BUT: My Item Level Texts are not returning anything. It makes sense to me as well because you cannot simply tell it give me the F01 texts you see because if you have multiple items, you will have multiple F01 texts, one for each item number if you put text to each item.
How can I get the item level texts out before saving the PO? Since the PO is not saved yet, there is no PO number and nothing is stored in STXH and STXL. Where are the texts stored and how can I retrieve them? I tried passing just the item number but as expected it still returned nothing.
Any ideas?

Answer 1

Ok I figured it out. I will add this for anyone else that may have this issue.
The short version is that just like header level texts, item level texts that have not yet been officially saved to the PO are stored in a catalog. If you were to debug READ_TEXT you will see that it will look in the catalog to see if there is an entry there for the corresponding texts (ex F01, F02 etc).
For header texts, you simply pass the language and which text you want without the PO number and it will return header texts.
Item level however you have to specify which line item you want plus which text and then the language.
During debugging if you debug Read_text and go to the FM READ_CATALOG you will see the following:
READ TABLE CATALOG WITH KEY CATALOG_KEY.
Load the table Catalog into the debugger and see how it stores them.
In one solution I read on this forum it said to use 10 zeros and then your item number.
Mine was stored with 10 spaces, not zeros. Loaded 10 spaces plus the item number and it returned my text with READ_TEXT.
Hope this helps someone else one day!!