Simple question: Declaration of the vaiable

I declared the following variables to parse character string,
Data:v_posfrom TYPE I,
       v_posto TYPE I,
       v_length TYPE I.
However, when I activate it, I got error:
Field type "I" does not permit subfield access.
What does it mean, and how could I correct it ?

Thanks Jay.
I used following clause to populate the value for those two variables:
        SELECT ZZPOSFR ZZPOSTO INTO (v_posfrom, v_posto)
        WHERE ZZRECID = wstr_bkpf-awkey(2).
        v_posfrom = v_posfrom - 1.   " 8
        v_length = v_posto - v_posfrom.  "3
        v_seg = wstr_bkpf-awkey + v_posfrom(v_length).
This is the place I used it.
What is wrong with it, I can not debug at the moment.

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