Field help (ABPNBZONE) 

The parameters for a batch task are entered in a variable dimensioned by default to 500.
This dimension can be insufficient if the parameters are entered in a window containing several tabs and/or grids.
This parameter is used to increase this dimension up to 9999. It must be used with precaution in order to avoid overloading the memory : the standard parameterization (500) reserves 44k of memory.