Questions we get asked about

Gemini processes files using generation numbers to ensure that files are loaded in a set order. If you receive this error message, you’ll need to raise a technical support request to confirm the expected generation number (if it’s not mentioned in the file response).

Example: If the last file processed in Gemini was with Generation Number xxx1, the next expected Generation number is xxx2. However, if Gemini receives the next file as any other number than xxx2, they will all be rejected and not processed in Gemini.

If you have a bulk number of files to submit, then you’ll need to ensure that the generation numbers are in order, e.g. 1, 2, 3, 4 etc.

To remove this lock, please call National Gas Transmission on 0370 191 0636. If you need further support, please call our Service Desk on 0845 600 0506. In both cases, you’ll be required to provide your Service ID, your User ID and the Gas Day.

Your User ID could have been locked for one of the following reasons:

• For GB Nominations, if two or more different User IDs try to update the same set of records (e.g. a combination of Service ID and activity number for that Gas Day), an error message will be displayed indicating that the records have been locked by another user.
  GB Nomination locks are auto-released after 60 minutes of the locks being applied. The user will get the same error message on the screen. Wait for 60 minutes for the locks to be auto-released.
  
  
• For EU Nominations, if the same connection point and shipper combination are being used by two or more different users to update the EU Nomination for a Gas Day, the data will be locked.
  
  
• The same restriction will occur if you select 'All' as the connection point and nominate using multiple User IDs. However, in this instance, all the connection points will be locked.

Whenever you exit from the Update Nomination Screen, it's essential to click on the Cancel/Save button and exit. If you click on the red X in the top right- hand corner, the data will remain locked by that User ID.

However, if the screen is left open, the lock will be in place for as long as the screen is open.