How to use BAPI_ENTRYSHEET_CREATE

Iam new to use BAPI_ENTRYSHEET_CREATE.

What are the mandatory fields that should be passed to it to create SES ( Service Entry Sheet ).

The data given to me is:

Purchase Ord number,

Activity Number,

Rate,

Quantity,

External Number.

Is the above data is enough to create SES.

Please give me the valuble information as early as possible.