How fill SIGN calling transaction with selection-option

Hi,

I can't receive -SIGN in selection-screen from anohter transaction

*********************************************************************************

Transaction 1:

....

SELECT-OPTIONS:
s_gart_c FOR mara-matkl MATCHCODE OBJECT h_t023 NO-
EXTENSION NO INTERVALS,

...
PERFORM bdc_field USING 'S_GART_C-LOW' s_gart_c-low. "Fill bcdata
....

PERFORM execute TABLES bdcdata USING <Transaction2>
....
Transaction 2:

...

SELECT-OPTIONS:
s_gart_c FOR mara-matkl MATCHCODE OBJECT h_t023 NO-
EXTENSION NO INTERVALS

*********************************************************************************
I receive correctly s_gart_c-low but s_gart_c-sign is not correct (exclude for example).

I tried pass S_GART_C-SIGN but I get an error: "Field S_GART_C-SIGN. does not exist in the screen <Transaction's program> 1000.

Any solutions?
Many thanks in advance!