After susseccfully XOG out a custom object we are getting an error attempting to XOG into another environment.
ORA-01400: cannot insert NULL into ("NIKU"."ODF_MAPPINGS"."MAPPING_CODE")
Release : 16.0.3
Saw mapping missing and looked like as below in the XOG output file:
<mapping mappingCode="" typeCode="" value=""/>
There were couple of attributes that had missing display mapping and after adding in Studio issue was resolved.