Dear CUBA platform support team,
Is there any way to implement KeyPress or Tab focus to opens the linked screen to select a value ( or same as comboBox selected) for the Attribute type is ASSOCIATION and Cardinality is MANY_TO_ONE.
Currently, user must be click mouse ( minimal …) to open link screen and choose value.
If you mean opening lookup screens through a PickerField or LookupPickerField, there is the default keyboard shortcut for it - CTRL-ALT-L, see Keyboard Shortcuts - CUBA Platform. Developer’s Manual
You can change the shortcut globally using the application property described in the docs, or change it for a concrete PickerField, for example: