Hello Diego,
Did you copy standard value assignment type SAP_RMS_1012_010 - Diet Suitability to create value assignment type SAP_RMS_1012_021 - Allergens ?
1) Then might chance that you copy Screen function program as mentioned in value assignment type SAP_RMS_1012_010 - Diet Suitability.
Also check
1) Sequence of Tab Pages for value assignment type SAP_RMS_1012_021 - Allergens
2) check configuration setting in "Set Up Table-Based Value Assignment" in Value assignment type to Object
Thanks
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