Can document links be added via scripting?

Can we add document links through scripting on Master Agreement header page? We are trying to mass update document links for about 3000+ records and hence I need to create a script (one time task) that can add these values on MA header page.

I am trying to create the document link defintion as follows:

DocumentLinkDefinitionIBeanIfc dld = (DocumentLinkDefinitionIBeanIfc)

TypeFactory.createObjectReference(620);

dld.setDisplayName("Test");

dld.setInternalName("Test");

dld.setLinkClassId(509);

dls.setSystemDefined(new

Boolean(false));

dld.setLinkDirectionType(new DocLinkDirectionTypeEnumType(3));

dld.setLinkDefinitionType(new DocLinkDefinitionTypeEnumType(3));

and then set this document link defintion to Document Link Bean as follows:

DocumentLinkIBeanIfc dl = (DocumentLinkIBeanIfc)

TypeFactory.createObjectReference(509);

dl.setExtRefDoc("99999");

dl.setExtRefLine("900");

dl.setLinkDefinitionObjRef(dld);

But this is giving me error.

Let me know if I am doing something wrong.

Any help will be appreciated.

-Regards,

Bindu Sharma