External Webservice and PreTransformation rules

Summary

Can you call an external Webservice from PreTransformation rule?

Content

Hi 

We are integrating transfer orders from an external legacy application. We need to bring alot more information relating to the transfer order than is available to hold against the transfer order (no DFF capability at present for transfer orders). We are thinking about holding the additional information in PaaS custom table. 

Once the the Transfer Order is interfaced into SaaS, we are using a supply orchestration rule to implement the transfer order as Sales Order. We want to use pre-transformation rules to enrich the order from  data stored in the PaaS custom table.