How to copy master data backwards from production to QA

Hello BI community,
Our transactional QA system was refreshed with a database copy of production, and the BW landscape was not refreshed. We cannot refresh the BW QA system because the production BW database is far too large to be duplicated.
So I'm searching for a way to bring all of the MASTER DATA up to date in the BW QA environment, without performing manual reloads.
Would it be possible to perform a copy of just the P,Q, X, Y, and T tables from production database to QA ? I believe this would cause inconsistencies with the S tables. But then, to copy the S tables backwards from production to QA would cause inconsistencies with the transational data providers.
Is it possible to do a "client copy" in BW where only the master data is transferred ? I think we'd be comfortable with reloading all new transactional data as necessary, just as long as the master data were brought back in its entirety from production to QA.
Any thoughts our guidance will be greatly appreciated !
Thanks,
Keith

big thanks to everyone who has replied, and especially for this suggestion!
The reason why we don't load the data from BW production is simply a matter of volume. It's a 7 TB data warehouse, and the master data sizes are huge.
One other option I was thinking of, since I used to be a basis guy, is to copy the entire production database and then delete, delete, delete away the transactional data until it's all gone. The only thing needed after that is a database real work to give the space back. Of course, the basis guy see that as a last resort
I'll try this suggestion above & then report back with the results... but I'm afraid the data sizes, again, will be prohibitive. We'll see.

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Hi
Go through the below process to extract Master Data Attribute from R/3
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Use
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How to load master data from SAP R/3 system like Customer master...........

How to load master data from SAP R/3 system like Customer master, materioal master , vendor master.............

Hi Bramha,
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/message/4708129#4708129 [original link is broken]
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Thanks

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Note 886102 - System Landscape Copy for SAP BW 2.X, 3.X and NW2004s BI
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How to copy master data backwards from production to QA

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