packing multiple materials in one Handling Unit

Dear Friends,

In an outbound delivery, I want to pack 8 materials in one single External Handling unit.

How should I use this?

Presently I am using BAPI_HU_PACK 8 times to do this in a loop & passing the same HU in parameter

BAPIHUKEY-HU_EXID for all the time but with ITEMPROPOSAL which is different all the time.

Is this the right way to pack multiple materials in the same HU?

Please share your experience..

Thank you.

Regards

Prashant