Unable to update multi-select field from another form's "On Validate"

Unable to update multi-select field from another form's "On Validate"

Hi Zoho,

I have a form with a multi-select field.
This field contain nothing, and populate on load of the form.

When trying to updating its data from another form (UpdateMe is the entry, MultiSelect is the field, Test123 is a list of strings (currently containing only 1 spot) I get the following:

Error in executing On Edit - On Validate script.
Error.
Error in executing IF rule : Error in executing If block.
Error in executing Iterate List task.
Error in executing Update Record task. Unable to update UpdateMe.MultiSelect .
Value Test123 not found.

this does not happen on drop-down fields that are empty and I update from another form, or when the list entries are manually defined as options on the multi select field.

Please help?

thank you

Ravid