You can create a workflow rule for a Call entity with 'after-record-created' trigger with a formula condition checking the number of records. Use record\count function https://docs.espocrm.com/administrat...a/#recordcount.
Code:
record\count('Call', 'accountId=', accountId) == 10
This workflow can either do some actions or trigger another workflow rule with a target record changed to a related account.
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