unable to invoke script

Hi,

Can anybody help why the following error comes?

(059) Could not process request document of type “PBI::SieTgt::OrderStatus::UpdateLineStatus”
(108) Could not invoke script “UpdateOrderLineStatus”
(108) Could not invoke script “UpdateOrderLineStatus”
(127) A Siebel error occurred while updating a record for the specified document type: “The selected record has been modified by another user since it was retrieved. Please continue.”"

thanks