In SAPscript, sysem has symbol SAPSCRIPT-COUNTER_x (x=0...9) for apply in your program. You can increase or decrease by 1 by option (+) or (-).

Syntax

&SAPSCRIPT-COUNTER_x(+)&    Increase by 1
&SAPSCRIPT-COUNTER_x(-)&    Decrease by 1

Example

&SAPSCRIPT-COUNTER_1&     =      1
&SAPSCRIPT-COUNTER_1(+)&  =      2
&SAPSCRIPT-COUNTER_1(-)&  =      1