i want run time structure values in table T166C while changing the PO in me23

Hi All ,

i Have one Requirement while changing the PO values in me23n i want to trigger new out put type using this table .

T166C- TNAME=table

T166C- FNAME= table Fields

T166C- XBEST=X then new output type to be triggered. If table T166C-XBEST=”blank”

No re output type should be triggered  

so any one have any idea when this structure will triggered .

Thanks,

Pradeep.