Memory ID

Hi,

i need to export a work area into memory and again reuse it in a BADI.

i hav declared like this.

data ls_vbak type vbak.

.........

export ls_vbak to memory id 'ZTEST'.

In badi, if i declare it as

IMPORT ls_vbak FROM MEMORY ID 'ZTEST'.

its throwing an error..

can any one tel me how to use the import in BADI? (oops concept)

Thanks,

Niyaz