Is This Content Helpful?
We're glad to know this article was helpful.
Merging feature classes or shapefiles with the Merge tool into a new feature class returns the error:
"001156: Failed on input OID <value>; could not write value '<value>' to output field <value>."
This error indicates ArcMap is unable to merge conflicting field types or field lengths from the selected feature classes or shapefiles to the new feature class.
During the merging process, error '001156' occurs when the feature classes or shapefiles that are selected for merging contain fields with conflicting field data types or lengths. For more information, please refer to ArcGIS Help: Understanding field properties, aliases, and table display options.
To add the conflicting data that was deleted into the merged feature class, create a new field and specify the field type and length, and use the Field Calculator to populate the new field. For more detailed information, please refer to ArcGIS Help: Calculate Field.