Changes to Update a purchaseorder

added the new optional request property attachments

added the enum value attachments to the property items/ of the query request parameter fields

added the optional property attachments to the response with the 200 status

added the new optional request property lineitems/items/exchange_rate

added the new optional request property lineitems/items/is_billable

added the new optional request property lineitems/items/project_id

added the optional property lineitems/items/exchange_rate to the response with the 200 status

added the optional property lineitems/items/is_billable to the response with the 200 status

added the optional property lineitems/items/project_id to the response with the 200 status

added the new CANCELED enum value to the status response property for the response status 200

added the new COMPLETED enum value to the status response property for the response status 200

added the new OPEN enum value to the status response property for the response status 200

added the new SERVICE_CHARGE enum value to the lineitems/items/fees/items/type response property for the response status 200

added the new TIP enum value to the lineitems/items/fees/items/type response property for the response status 200

added the new optional request property metadata

added the enum value metadata to the property items/ of the query request parameter fields

added the new CANCELED enum value to the request property status

added the new COMPLETED enum value to the request property status

added the new OPEN enum value to the request property status

added the new SERVICE_CHARGE enum value to the request property lineitems/items/fees/items/type

added the new TIP enum value to the request property lineitems/items/fees/items/type

added the optional property metadata to the response with the 200 status

added the new optional request property category_ids

added the enum value category_ids to the property items/ of the query request parameter fields

added the optional property category_ids to the response with the 200 status