The following fields must be filled in:
M260 Title
M259 Item description
M261 Legal product description
M253 Functional designation
M287 Packaging level
M286 Type of packaging
M284 Packaging material
For at least one hierarchy level (if you have not declared a logistic hierarchy, then declare everything on the base article).
M241 Batch management
M245 Actual invoicing unit
M244 Is order unit
M247 Is consumer unit