Does anybody know why Packaging Code field in material master is missing?

Hi EHS & DG masters,

I´m working with DG checks.

I've read all documentation in SAPHELP on Integration of DG in Handling Units (Shipping Documents), and I've two issues:

1 First of all I can't select the Packaging Code in Material master of dangerous goods despite the fact I can manage the values in customizing.

2 The second cuestion is related with:

Select the material you want to pack and choose Extras -> Allowed Packaging Material or choose   with the quick info text Select Allowed Packaging Material.

The result is the following message (I expected a special dialog Selection of DG data for packaging).

Any help would be greatly appreciated.

Thanks,

Diego Ferrando.