Auto Number Range Assignment to Legacy Values and send to ECC

Hi Experts,

I am working on a HCM Rapid Mart - BPDM .

Migrating from SQL Server to SAP ECC.

I am using IDOCS

I have number ranges coming from legacy system and needs to convert the same to SAP ECC Number range.

I have extracted the internal number ranges from SAP and kept it in a lookup file.

Can anyone let me know, how to write a function or how to use this in a Lookup_ext, so that once new number from sap gets assigned then i can send this IDOC to SAP ECC.

         SQL Server

      Object Id     Type     Text

         1                 O      OrgUnit1

         2                 S      Position1

         3                 C        Job1

         4                 O      OrgUnit2

         5                 S      Position2

         6                 C        Job2

In SAP Internal Number Range assigned for Orgunit, Jobs and Positions

Orgunit            10000000             19999999

Jobs                 20000000             29999999

Positions         30000000             39999999

Output Should be as below.

             SAP ECC

      Object Id       Type         Text

    10000000         O              Org.Unit

     20000000        S             Position1

     30000000        C              Job1

    10000001         O              Org.Unit2

     20000001        S             Position2

     30000001        C              Job2

Thanks,

A Sustainer