Hi Antonio,
Please note that MB56 is a Standard SAP transaction. This is a Batch where-used list that presents the Batch information in a Hierarchial Format. This represents the Parent-Child Relationships between the Batches. When a Batch is Goods Issued against a Process order and when a Child Batch is received against a Process order, it forms a parent child relationship which is depicted through MB56 transaction. Similarily Interplant Stock Transfer is also captured in MB56. Hope this helps you. I tried to attach a document but could not. Please send me your email ID and i can send those screenshots to you if needed.
Regards
Ram