Columns for mapped attributes of custom item are not persistent in AddToTeamcenter Interactive.
Solution
Make sure the Teamcenter Preference 'seec_itemTypeList_SE_Part' contains 'Item'.
Notes and References
Hardware/Software Configuration
Platform: INTL64
OS: windows
OS Version: 10_1809
Product: SOLID_EDGE
Application: DOC_MANAGEMENT
Version: V220MP5
Function: SEEC
Ref: 001-9750663