Automated value generation for key field in db table

Hi All
I have created a table in SE11 and i want to autogenerate a value for the keyfield when the user adds a new record to the table. the keyfield is of type numc. this field represents a document id hence i do not want the user to physically enter in an id. Is it possible to achieve this without any additional coding. I am using a WDA app together with an adobe form to allow user to input data.
Thanks in advance
Regards
Thashin Naicker

There is one more method to do that.
Write a query to fetch all the records from the table into any temporary internal table.
  Then, do a looping in that table & increment one temporary variable inside a loop.
after this add first value of your primary field  to this temporary variable..
Ex.: To add one more record with an increment to a primary key field  is shown below:
DATA: TEMP type I.
TEMP = 1.
SELECT * FROM <TABLENAME> INTO TEMP_TABLE.
    ENDSELECT.
LOOP AT TEMP_TABLE.
      TEMP = TEMP + 1.
    ENDLOOP.
<Tablename>-<fieldname> = TEMP_TABLE-<fieldname> + TEMP.
Note: temp is a temporay variable and temp_table is a temporary table.

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