What do I do if I see the error message "Inquiry external reference is already in use" when trying to save a Bunker Requirement?
FAQs > Error Messages > Cannot Save Bunker Requirement - "Inquiry external reference is already in use"
There may be instances when you want to change the bunkering port under the Inquiries and Purchase of a Bunker Requirement but encounter the following error message:
![](../__attachments/637501629/image-20200821-080036.png?inst-v=1a30baa6-6eff-40fe-8230-9a183e254628)
This occurs when the information is interfaced from an external source into the Veson IMOS Platform and contains an external reference.
![](../__attachments/637501629/image-20200821-080211.png?inst-v=1a30baa6-6eff-40fe-8230-9a183e254628)
To resolve this:
Remove the external reference from the Inquiries and Purchases grid and save the Bunker Requirement.
Change the bunkering port.
Re-enter the external reference and save.