On se71 editor can I write like this?

I have &RFKHELP-QSFBT& which is printing on script output...

Some time in driver program it assigns -ve sign to &RFKHELP-QSFBT& value for the calculation.

Can I change &RFKHELP-QSFBT& value, if it contains any -ve value ...

to +ve value like..

is the syntax :

IF &RFKHELP-QSFBT& CA '-'.

&RFKHELP-QSFBT& = &RFKHELP-QSFBT& * -1.

ENDIF.

??

Could you please suggest me ?