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QuickBooks Error Code 140300 occurs when you reach the maximum limit of items allowed in your list. This can hinder the addition of new items and disrupt business operations. To resolve this error, follow these steps:

Review Your Item List: Start by reviewing your current item list for any items that you no longer use or need. Deactivating or deleting obsolete or duplicate items can free up space.
Condense Data: If your QuickBooks version supports it, use the Condense Data feature. This helps by archiving old transactions and reducing the company file size, potentially freeing up item list space.
Increase List Limits: If you’re consistently hitting the limit, consider upgrading to a version of QuickBooks that supports a larger number of list entries, such as QuickBooks Enterprise, which offers significantly higher limits.

By efficiently managing your item list and considering an upgrade if necessary, you can overcome QuickBooks Error Code 140300 and ensure seamless operation of your QuickBooks setup.