We're committed to resolving this issue and ensuring you receive the support you deserve, @arittintec. Please know that your satisfaction is important, and we are here to assist you in any way we can.

Have you tried the following suggested troubleshooting such as: 

• Delete and re-create the transactions
• Make sure QuickBooks Desktop is up to date
• Run the QuickBooks Tool Hub. 

If the issue persists after following the abovementioned solution, I recommend calling our technical support team. Our experts can review and further examine the error in a safe place. 

Proceed as follows: 

1. Press F1 on your keyboard to open the Help page.
2. Click Contact Us.
3. Enter your concern in the box and select Continue.
4. Choose either Start messaging or Get a callback.
5. Complete the required data and submit the request.

Make sure to contact them within business hours to ensure a swift response.

Moreover, check out the following articles below to learn how to create templates for your sales forms and manage receivable transactions in QuickBooks: 

• Use and customize form templates.
• Sales and customers FAQs

You can always return to this post if you need further assistance fixing error 350. The Community and I will be here to help you. Keep safe, @arittintec.