Limition of select-option

Dear All,

I am facing one issue during one report. Existing report code appending record for select-option like s_kunnr e.g,

LOOP AT ITAB.

S_KUNNR-LOW = ITAB-KUNNR.

S_KUNNR-SIGN  = 'I'.
S_KUNNR-OPTION = 'EQ'.
APPEND S_KUNNR.

ENDLOOP.

Now i am using that S_KUNNR in my select query but when S_KUNNR cross the 9998 records then query will not execute and it gives dump error.

So is there any fix limit of select-option field or what should we have to do for the issue.

Please give feedback.

Regards,

Shivam.