PROBLEM
The Append tool appends multiple input datasets into an existing target dataset of the same type. In some instances, appending data to a feature class in ArcGIS Pro returns the following error:
Error: 001156: Failed on input OID <value>; could not write value '<value>' to output field <value>.
This issue occurs due to one of the following causes:
Refer to 01156: Failed on input OID <value>; could not write value '<value>' to output field <value> for more information.
To resolve this issue, use one of the solutions below, depending on the cause.
Create a new field to match the data type and use attribute field mapping when appending
Increase the number of allowable characters of the field
To append data between feature classes, the field values from the input dataset must not exceed the target field length. To solve this issue, increase the number of allowable characters for the target field before appending data. Use the Alter Field tool to set the new maximum number of allowable characters for each field.
Note: This option is only applicable to fields of type TEXT or BLOB. If the table is empty, the field length can be either increased or decreased. If the table is not empty, the length can only be increased from the current value.
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