Error Message
The following error message may occur in Boekhoudgemak or Multivers:
"The collection of VAT transaction rules contains duplicates."
This error typically indicates an issue with the VAT configuration of the selected general ledger account.
Possible Cause
Please verify the settings of the selected general ledger account in Boekhoudgemak or Multivers.
In many cases, the account is configured with the VAT type:
Outside VAT
When a general ledger account is set to Outside VAT, no VAT may be posted to that account.
If a transaction is submitted with a VAT code or VAT amount while the account is configured as Outside VAT, the system may return the following error:
"The collection of VAT transaction rules contains duplicates."
Recommended Checks
Review the following settings:
The VAT type configured on the general ledger account.
Whether the account is marked as Outside VAT.
Whether a VAT code is being applied in the transaction.
Whether the VAT code used is compatible with the account configuration.
Contact
If the issue persists after reviewing the account settings, please contact your support team and provide:
The exact error message.
The booking or posting scenario being used.
The affected general ledger account.
Screenshots of the VAT configuration and transaction details.
Providing this information will help identify and resolve the issue more quickly.