1. Layer selection choice is getting corrupted when feature classes are stored within a feature dataset in Input drop box of Add field Tool (Data Management>Fields).
2. When the core Add Field geoprocessing tool (Data Management) and with the geoprocessing set to run as a background process, Select a layer from the TOC as the input table and add an arbitrary field to the layer, after successful tool execution we see that if we open the Add Field tool a second time and observe that at least one layer has disappeared from the input table drop-down choices.
Tested on following combinations:
1. Created a new Personal as well as file geodatabase > feature dataset and imported the ESRI sample data, however able to reproduce this issue.
2.Created new personal as well as file geodatabase > feature dataset and imported user data to the geodatabase, however able to reproduce the issue.
1.Launch Arc Map 10.0 and add data.2. Go to editor toolbar > Start Editing>Select the feature Class.3 .Right Click on featute Class in Table of Contents> Open Attribute Table> Table Options>Add Field>Give required parameters> Press Ok4.Go to Editor Toolbar >Save Edits> Stop Editing.