Diagnosis
A value for object type &v1& was supposed to be read from an IDoc ofmessage type &v2& - and from a segment of type &v3&.
A reference from this object type to a field in this segment is notmaintained in ALE Customizing.
Object values are read from an IDoc in the ALE layer in the followingcases:
- recipient determination (the configurations here are in the customerdistribution model)
- when linking the IDocs with an application object
- when serializing IDocs in application input
- when using lists for master data distribution

Procedure
In ALE Customizing, check your configurations for the options Masterdata distribution->Lists, serializing and linking. Furthermore, checkthe configurations in your customer distribution model. If they arecorrect, maintain the missing object type in ALE Customizing, orconsult your ALE administrator.