Bank account formats - checks

Question

Dear all,
Does someone have any idea how I can see how the format of the bank accounts are checked in SAP? (for different bank countries)?
I need to clean a list with bank accounts so their format is accepted by SAP when I upload them.
Is there any possibility to do some kind of simulation check on an Excel list?
I found T005, but that's a bit vague "maximum length without gaps = 18" not?
How about the bank keys? How can I know if there is a logic behind the bank key structure for a certain country? How do I know which format/length the bank key needs to have?
Thanks in advance

Answer 1

This is what sap documentation for bank keys says:
<i><b> In this field, you specify the bank key under which bank data from the   
respective country is stored.                                                                               
When you define the country key, you also specify the country-specific   
definition of the bank key.                                                                               
Normally, you manage banks using their bank number. The bank number in   
the control data for the bank is then displayed twice, that is, as the   
bank key too.                                                                               
In certain countries, the bank account number takes on this function;    
then there are no bank numbers and the bank data is managed using the    
account number.                                                                               
For data medium exchange, you may find it useful to be able to enter     
foreign business partners without a bank number, even if there are bank  
numbers in the country in question. In this case, the bank key can be    
assigned internally.                                                                               
To manage bank data using another key, for example, the SWIFT code,      
external number assignment can also be used.                             </b></i>