Fuente: https://www.greytrix.com/blogs/sagex3/2015/09/01/how-to-set-cursor-to-a-given-edit-box-via-code-in-x3/
There can be occasions when you want to Move focus/cursor to a particular tab, edit box or drop down programatically.
In a custom development we have come across the above scenario where in we need to move cursor to second tab automatically when user enters valid sales order number in first tab.
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To do this we need to set zonsui = “<fieldname>” at end of the after change of Sales Order number field.
<fieldname> is screen’s mask name of the destination field. Please refer below code for more detail.