Adding portion in EAMABI and EA10 transaction

Hi,

I need to find a way in order to add other portion besides the ones specified in input at the beginning of the elab. of the transactions:

EAMABI

EA10

For example: the EA10 is called with portion R0000001; i need to search with this porton in a custom table in order to retrieve if i need to add another one:

R0000001 -- R0000002

In this case, I should add the portion R0000002.

For EAMABI i found the exit EXIT_SAPLEA02_002. It should work but it's called after the search in etrg...and this is not so good..

Anybody has a good idea?

Thanks,

Gabriele