>Hi
>Why do I get the expression invalid error message?
>

cgship=substr(othernr.shipmentid,3,3)
>
>thisform.grdnrother.shipment.dynamicbackcolor= [IIF(alltrim(cgship)='G',rgb(255,0,0),RGB(255,255,255))]

the .DynamicBackColor is evaluated at each row as its being displayed, and not at the time you set the property... you would have to include the whole thing as...

thisform.grdnrother.shipment.dynamicbackcolor= ;
    [IIF(alltrim(substr(othernr.shipmentid,3,3))='G',rgb(255,0,0),RGB(255,255,255))]