ABAP problem with characteristic and start routine

Dear all,

I need to transfer attribute to characteristic. So I read several threats and created start routine for filling values into internal table and characteristics routine for reading master data from internal table and filling infoobject with attribute value

InfoObject = 0CRM_PROD, attribute = 0CRM_PREF

I'm new to ABAP, please help me

Start routine code has no syntax errors:

===============

TYPES:

BEGIN OF lt_prod,

CRM_PROD TYPE /BI0/PCRM_PROD,

CRM_PRREF TYPE /BI0/PCRM_PROD,

END OF lt_prod.

DATA:

t_prod TYPE HASHED TABLE OF lt_prod

WITH UNIQUE KEY CRM_PROD.

DATA:

fl_prod type lt_prod.

select CRM_PROD

CRM_PRREF

from /BI0/PCRM_PROD

into table t_prod

for all entries in SOURCE_PACKAGE

where CRM_PROD = SOURCE_PACKAGE-CRM_PROD

and objvers = 'A'.

===============

Characteristic routine code has error "Field "FL_PROD" is unknown"

===============

clear fl_prod.

READ TABLE t_prod INTO fl_prod

WITH TABLE KEY CRM_PROD = SOURCE_FIELDS-CRM_PROD.

RESULT = fl_prod-CRM_PREF.

===============

Please help me, where is a mistake? Why internal table fl_prod declared in start routine is not available in characteristic routine?

Thanks in advance