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After modifying a CDT, the CDT fields are no longer present and the following message is observed when the object is opened in Designer: "Simple Types cannot be edited". This can also be seen on a parent or child of the CDT that was modified.
"Simple Types cannot be edited"
This issue has been reported to the Appian Product Team. The reference number for this issue is AN-182130.
To workaround the issue, perform one of the following steps:
This article applies to Appian version 19.1 and later.