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When performing a customer merge, data from two customers is combined into a single customer record.  This process involves selecting the customer you plan to keep (target customer) and then merging data from another record (source customer) into the target.  Once the merge has been completed, the source customer is removed, leaving only the target.

In this process, there are several things that could cause merge failures due to specific data in the customer records being merged.

Problem

Customer merge fails with an error messages containing the following text:

An error occurred while trying to merge the selected customer data into the current customer.  Please try again.

Error details contain the following information:

CustomerMerge failed for SourceCustomerId (SourceCustomerId), TargetCustomerId (TargetCustomerId): String or binary data would be truncated.

Solution

This error is caused because certain data fields contain data that when combined is too long to fit into a single record. This must be corrected manually before the merge can be completed.

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