RMDs and two accounts

We continue to be perplexed by how to enter the following RMDs are shown when there are two custodians.
 
Two IRA accounts.  A calculates its RMD to be $900, B calculates $9100. A total of $10,000.
Amount taken from A is $0.  The amount taken from B for that purpose (an error) is $11,000
No 1099-R is sent from A, but B indicates the withdrawal on the 1099-R of $11,000
 
How do we answer the questions provided in the desktop interview regarding B, the one that sent the 1099-R?  The "Required" RMD for B alone of $9100 is smaller than the actual withdrawal from the B's account. Do we show $10,000 (the actual combined calculated RMD) or $11,000 (the actual amount withdrawn)?
 
How does the worksheet in Form 5329, Part IX, fit into the reporting in this case?  Is this where the custodian's data goes that didn't issue a 1099-R?  If true, why isn't this mentioned during the interview process?  What's the purpose of that worksheet, and where do those numbers get reported or carried forward?
 
It seems that a distinction between the calculated RMD and the actual amount withdrawn would be helpful. 
Thanks for any clarification.