This error may occur when trying to use the Inverse command or the Traverse tool to populate the COGO fields for a line feature class.
"Inverse: An unexpected failure occurred. The field is too small to accept the amount of data you attempted to add. Try inserting or pasting less data."
The COGO fields will not be updated.
This is due to one or more of the COGO fields not being wide enough for the value attempting to be stored.