On Jan 14, 2021, the maximum character limit for the Source ID contact field is increasing from 40 characters to 120 characters so that larger identifiers can be stored using this field.
Impact: If you are writing this data from Cvent to any specific field of external system, then ensure that your external system field can accept the values of up to 120 characters from Cvent. Else, the data sync for the specific contact or attendee record may fail.
Please check your Cvent API and Integrations solutions – SOAP API, REST API, Marketo Integration, Eloqua Integration, and Salesforce Integration.
Note: Cvent Salesforce App currently accepts values for Source ID for up to 100 characters. This will be increased to 120 characters in future version after 5.1.