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Edwin VijayEdwin Vijay 

getDmlMessage returning complete error message and not truncated one

Apex Code:
                    showsuccess = true;
                catch(DmlException e){
                    for(integer i=0; i < e.getNumDml(); i++){
                        ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR,e.getDmlMessage(i)));
                    showsuccess = false;
                    return null;

Error message:
OppLnItemTrigger: execution of AfterUpdate caused by: System.DmlException: Update failed. First exception on row 0 with id 0064000000f8EeIAAU; first error: FIELD_CUSTOM_VALIDATION_EXCEPTION, The selected product does not exist in EDW yet.Please update your selection or try again later.: [] Class.TriggerHandlerBase.updateObjects: line 172, column 1 Class.TriggerHandlerBase.processObjects: line 61, column 1 Class.TriggerDispatcherBase.execute: line 128, column 1 Class.OppLnItemDispatcher.afterUpdate: line 78, column 1 Class.TriggerFactory.execute: line 43, column 1 Class.TriggerFactory.createTriggerDispatcher: line 19, column 1 Trigger.OppLnItemTrigger: line 2, column 1

I only want to display the error message: 'The selected product does not exist in EDW yet.Please update your selection or try again later'

Any help is appreciated. THANKS 
SandhyaSandhya (Salesforce Developers) 

Try using 

Please refer below post there are different solutions it may help you.

Hope this helps you!

Please mark it as solved if this helps you so that it will make available for other as a proper solution.

Thanks and Regards