Error while saving NEW ITEM with linked fields

I wanted to add a text field for each item group, so that when I select any item group in NEW ITEM the text field shows respectively.

Here is what I did

  1. I went to Item group
  2. click Customize, and added a Small Text field named as Category Attributes.
  3. Then I wen to ITEM and added a link field to category attributes from Item group.
  4. Everything is working fine and desired data is fetched but when I save the item, an error shows.
    ”Could not find Category Attributes: Brand - Ply - Size - PO+Ratio Details - Quality - Separator Citi Trends - 7 PLY Corrugated - 62x33x30 - 159807 - Ratio - Corrugated - Separator - White Paper Pasting”
    **how can I fix this?
    **
    I have attached pictures for visual aid

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