Unable to select content type of document while creating from sharepoint designer workflow in Sharepoint 2007

We are using Sharepoint 2007.

We have a document library with multiple content types.

We have a list, when a new list item is created, based on one of the field value, the document is created in document library with specific content type using sharepoint designer workflow.

We are setting the field "Content Type" while creating the item in document library in the workflow, but the document is always created using the default content type.

Any suggestion on how we can set the content type of the document library item in the workflow.