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I'm trying to merge several layers for a "Count Overlapping Polygon" tool which requires one layer. I have data for fire occurrence polygons in the forest from 1969 to 2016. I can't get the layers to merge. Using 10-3-1. So far, I have tried to simplify a subset of layers in the attribute tables to where there is only 6 columns (FID, Shape, ObjectID, Date, Shape_Leng, Shape_Area). This still doesn't allow them to merged.

The error message is:

error 001156 : Failed on input OID ; could not write value '' to output field .

ArcGIS 10.3 Locate topic Description

A value could not be added to the output field. For example, text values cannot be added to numeric fields, and text values cannot be added to text fields if the values are longer than the field length.

Solution Change the field type or increase the field length in the field map properties.

It suggests to increase the field length but none of the columns have that options.

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    When you run Merge, remove all fields from the Field Map except for Date. – klewis Nov 2 '16 at 23:24
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When you run Merge, remove all fields from the Field Map except for Date.

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