Accessing variable across User Exit (i.e. across function pools)

Hi,

I have writen a user exit for MB31 transaction. Which uses following function modules...

EXIT_SAPLIPW1_001

EXIT_SAPLIPW1_004

EXIT_SAPLIE01_005

EXIT_SAPMM07M_001

First three functions belongs to XQSM function group and last function fuction belong to XMBC function group.

I have two top includes, ZXQSMTOP for first 3 and

ZXMBCTOP for the last one.

I am not able to access the variables declared in ZXMBCTOP in the first 3 functions...

(I am using EXIT_SAPMM07M_001 only to get the posting date.)

How to do it?

Advance thanks.

Regards,

Balaji Viswanath.