Flow custom field from CRM to ECC KNVK table

Hi ,

My CRM system Contact number and ECC contact number are not in same range. Now I have a requirement to update a custom field in KNVK table whenever a relationship is created in CRM between Entity-Contact. I am searching a place where I can update KNVK table with the custom field.

I am not sure if this activity can be done in event from TBE34 table ? Please suggest.

Thank you.