excel - VBA on change event ruins the ListObjectTable on extending rows -

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my code works listobject.table , intended allow editing prices , calculating discounts or vice versa... on entering cell editing turns formula therein value , pastes formula in column.

it works charm when user editing cells. if user tries add rows listobject.table, macro ruins table. adds couple of columns , headers replaced.

is possible make macro somehow disregard operation of adding new rows or extending range of data.table?

here macro, thank friends advice:

private olistobj listobject

private sub worksheet_beforedoubleclick(byval target range, cancel boolean)  set olistobj = worksheets("quotation").listobjects("tblproforma")  application.enableevents = true      if not intersect(target, olistobj.listcolumns("price").databodyrange) nothing     application.enableevents = false     application.autocorrect.autofillformulasinlists = false     target.formula = target.value     application.enableevents = true     end if      if not intersect(target, olistobj.listcolumns("discount").databodyrange) nothing     application.enableevents = false     application.autocorrect.autofillformulasinlists = false     target.formula = round(target.value, 5)     application.enableevents = true     end if  end sub    private sub worksheet_change(byval target range)  dim pricediscountoffset integer: pricediscountoffset = activesheet.range("tblproforma[[#all],[price]:[discount]]").columns.count - 1  set olistobj = worksheets("quotation").listobjects("tblproforma")  application.enableevents = true       if not intersect(target, olistobj.listcolumns("price").databodyrange) nothing     application.enableevents = false     application.autocorrect.autofillformulasinlists = false      target.offset(0, pricediscountoffset).formula = "=if([@[price]]<>"""", -([@[price]]-[@[pricelist]])/[@[price]],"""")"     application.enableevents = true     end if      if not intersect(target, olistobj.listcolumns("discount").databodyrange) nothing     application.enableevents = false       application.autocorrect.autofillformulasinlists = false     target.offset(0, -pricediscountoffset).formula = "=[@[pricelist]]-([@[pricelist]]*[@[discount]])"     application.enableevents = true     end if   end sub


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