Field level routine E:Field

HI All,

I am getting below error while converting field routine from 3.5  to 7.0 field level routine.

IF SOURCE_FIELDS-/BIC/ZCR_ASMRD NE '00000'

AND SOURCE_FIELDS- /BIC/ZCR_ZRT2 GE 0

       RESULT='1'

         ELSE

     RESULT='0'

ERROR :  SOURCE_FIELDS -/BIC/ZCR_ASMRD is unknown .IT is neither in one of the specified tables nor defined by a 'DATA' Statement.

Thanks,

Mohan