QM Usage decision posting transmitting via IDoc MBGMCR

Dear QM gurus,

I have a question related to UD distribution respectively distribution of material document created once UD is recorded; the distribution is IDoc-based (message MBGMCR). My idea is to create output message (e.g. ZUDD) for ALE trans. medium and logical system LS but don´t know what processing program / routine should be used. The distinction of material document created from UD is a transaction / even key WQ. The IDoc handling will be done via XI, so how to trigger output message from R/3? The purpose is to distribute information of stock posting (from initial QI to UU or BL) to external WMS system.

Thanks for your thoughts and comments.

Best regards,

Pavel