When trying to enter more than 20 characters for field Product Category ID you are getting the following error:
Your entry is too long. Do not enter more than 20 characters
Reproducing the Issue
1. Go to Products work center
2. Select Product Categories view
3. Select Maintain Product Categories
4. Select Actions button
5. Select Add Subcategory
6. Enter Product Category ID
Maximum allowed length for Product Category ID is 20.
This is expected system behavior.
Maintain a value which has 20 or less than 20 characters.
KBA , LOD-CRM-PRO , Products , How To