If a request is handled several times, duplicates might occur. You can prevent duplicates as follows:
RequestControl: Requests sent by CRM.pad are (automatically) sequentially numbered. If e.g. the network connection is interrupted and the information about a successfully processed request could not be sent to the client anymore, the server recognizes (based on the numbering) that this request was already processed.
Key fields: If key fields are applied, the existence of these fields can be checked. If a record with the same key field values and the same link records already exists, the existing record is used.
If you use key fields, you must define Template filters that apply the key property. You can assign these Template filters in the following input arguments of the SerialEntry action call, >> SerialEntry.