I have a form where I have subsecuent pick lists being updated dynamically based on the previous one selection.

The issue I have is that when the user updates the first value, the script moves through the whole chain of picklists until the an error is issued based on the null selection of values. 

in other words, when a pick list is assigned with values, the script considers that as a user input which triggers the next pick list assingment. This ends up with a mistake at the end of the chain.

I hope I explain myself.

The application is "Sistema de Operacion Yaxche, the form is "Insumos_Buscar".

what I expect is that when the next pick list gets values it waits for the user to select one before updating the next picklist....

thanks for the support.

cheers

Luis