DDIC cache will store the structure of the IDoc when it is first being pulled from SAP system. If there is any change in the IDoc structure, sometimes it will not get reflected in webMethods when you try to pull again the same. Reason being, it will use the cache to create the Idoc document. We have to delete it in DDIC, which will make sure the new structure gets pulled from SAP system, and not the old one.
For more details, refer SAP adapter guide.
-Senthil
#webMethods#webMethods-General#Integration-Server-and-ESB