angular2-multiselect:display selected values in list while editing module

I am using angular2-multiselect-dropdown for multiple dropdown in angular4. It's working perfect while creating the records, but not working fine during updation.

All previously selected values should be checked, and not able to select twice. but here it's not already selected and one can select same value again.

attaching screenshot, please let me know what can i do. will update my code if required.



Thanks in advance.

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