If you wish to use the date range method with the MTD Vat Submission module, you must only use one VAT account. Having multiple VAT accounts will create issues. This is because of how the system calculates the NETS. This means you cannot split your VAT accounts into quarterly or monthly accounts if using the Date Calculation method.
The system scans the entire ledger except the VAT accounts you have input into the VAT submission window (e.g. 850.02) and it looks at the flagging (V,N,etc) to calculate the NET.
The system cannot know that your second VAT account (e.g. 850.03) is actually a VAT account, so it sees the entries in here that fall within the date range as part of the NET amount. This means your NET is always going to be overstated when using the date method and multiple vat accounts.
This also creates another issue, in that when you go to submit your VAT for account 850.02, all transactions in 850.03 that fall in the date range will be flagged by the system as submitted and your current and future VAT Return will not have correct figures. These transactions in the second VAT account that have been set as submitted will need to be manually corrected by TPH Support.
If you wish to use multiple VAT accounts for MTD Submission then you must move to using Periods for your VAT Calculation. See: Digital Vat Submission
If you still wish to use the date method with your vat submission, you need to move to only using one VAT account when using the date range or be VERY careful with entering in dates, ensuring your submission date ranges do not overlap your multiple VAT accounts. If the dates do overlap, then your net figure and subsequent VAT figures will not be correct.