In the recent news story titled "Urgent reminder to use previous document N337" Document 337 was associated as a previous document type that only supports reference formats to the DSDT. However, this is not true for document 337 of the declaration H2 which does allow reference to both DSDT and G4, being equivalent in this respect to the N337 of other customs declarations, as explained in its technical guide.

It should be noted that this does not apply to the previous document 337 for the declaration ETD. In this declaration, it will be necessary to use document N337 to reference declarations. G 4 and DSDT. It is recommended to consult the updated technical guides for each customs declaration to verify the document before using it.

It would be advisable to adopt as soon as possible The previous document N337 (or its equivalent that allows both DSDT and G4 to be dated) in all customs declarations to avoid serious problems in customs declarations, especially in the air environment.

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