AFAIK, the Next field works only with Mailmerge.

How are you populating the table?  Here's how you would use VBA to do it.
You will need to set a reference to the DAO object library to use it:

Dim myDataBase As Database

Dim myActiveRecord As Recordset

Dim i As Long

Dim dtable As Table, drow As Row

'Open a database

Set myDataBase = OpenDatabase("c:\Access\Procurement Plan.mdb")

'Access the first record from a particular table

Set myActiveRecord = myDataBase.OpenRecordset("Currencies",
dbOpenForwardOnly)

'Add a table to the document with one row and as many fields as there are in
the database table

Set dtable = ActiveDocument.Tables.Add(Range:=Selection.Range, NumRows:=1,
numcolumns:=myActiveRecord.Fields.Count)

Set drow = dtable.Rows(1)

'Loop through all the records in the table until the end-of-file marker is
reached

Do While Not myActiveRecord.EOF

   'Populate the cells in the Word table with the data from the current
record

   For i = 1 To myActiveRecord.Fields.Count

       drow.Cells(i).Range.Text = myActiveRecord.Fields(i - 1)

   Next i

    'Add a new row to the Word table and access the next record

   Set drow = dtable.Rows.Add

   myActiveRecord.MoveNext

Loop

'The last row will be empty, so delete it

drow.Delete

'Then close the database

myActiveRecord.Close

myDataBase.Close