Declarare Field in Elements.xml

<Field ID="{183A04D0-EF2C-483f-B643-16DA7A9DC01C}" 
         Name="Primitor" 
         StaticName="Primitor" 
         DisplayName="Primitor" 
         UserSelectionMode="PeopleAndGroups"
         UserSelectionScope="0"
         Mult="TRUE"
         Group="NT Group" 
         Type="UserMulti" 
         Presence="TRUE" 
         Required="TRUE" 
         ShowField="Title"
         Overwrite="TRUE"
         SourceID="http://schemas.microsoft.com/sharepoint/v3"/>
  <Field ID="{4C09CB12-9FCC-40f1-852F-D9F0F165BE29}" 
         Name="SenderComandant" 
         StaticName="SenderComandant" 
         DisplayName="Comandant" 
         Group="NT Group" 
         Type="User" 
         Presence="TRUE"
         Required="TRUE" 
         ShowField="Title" 
         UserSelectionMode="PeopleOnly" 
         UserSelectionScope="0" 
         SourceID="http://schemas.microsoft.com/sharepoint/v3" />

  <Field ID="{e32a112a-57ae-475c-ba43-e9d499256a2a}"
         Name="PrimitoriiNT"
         StaticName="PrimitoriiNT"
         DisplayName="PrimitoriiNT" 
         Group="NT Group"
         Type="LookupMulti" 
         Required="TRUE"
         ShowField="Title"
         Overwrite="TRUE" 
         OverwriteInChildScopes="TRUE"
         List="{924244a1-05c2-4708-af0f-fce568527907}" lista de unde ia datele
         WebId="70f0ed79-9b3e-471c-9f14-5111dc15c181" web unde este lista de unde ia datele
         Mult="TRUE" 
         Sortable="FALSE" 
         UnlimitedLengthInDocumentLibrary="FALSE"   
         SourceID="http://schemas.microsoft.com/sharepoint/v3"
         ColName="int1" 
         RowOrdinal="0" />

Neaparat de pastrat ordinea asta ca altfel da eroare