Here we would like to draw your attention to OS55 transaction code in SAP. As we know it is being used in the SAP CA-GTF (General Application Functions in CA) component which is coming under CA module (Cross Application).OS55 is a transaction code used for Material Revision Level Sequence in SAP.
It comes under the package CC0C.
Transaction OS55 technical data table
|Purpose||Material Revision Level Sequence|