Alter Field Not Working/Glitch

[DanaThompson1]

I am using Alter Field in a Task to change a field name so I can prepare a layer to append properly.

The Alter Field fails because Error001625: https://pro.arcgis.com/en/pro-app/latest/tool-reference/tool-errors-and-warnings/001001-010000/tool-... - can't alter field nullability.

I'm not trying to alter field nullability, but I don't have the option to change that. I closed and reopened Alter Field several times and saw that below, for the first 1-2 seconds the window appears as on the left. Then the New Field is Nullable and New Field Type parameters disappear. Does anyone else have this issue?

  After

[JoeBorgione]

The late great George Carlin would add Alter Fields to his list of oxymorons...

[DavidPike]

Software documentation

[JoeBorgione]

this guy writes a lot....

[DanaThompson1 · Accepted solution]

All, I found a workaround.

I used the Feature Class to Feature Class tool to export an intermediate file of the data. The tool has a built in Field Map, just like what you see in Append. From there I was able to alter the field name (right click & rename) and export the file, before I proceeded to Append in my Task using matching field names.