The OData V2 and SAP and OData V4 translators do not set column metadata such as precision and scale and length the is supplied to it through $metadata call on to the schema it builds on Teiid. Then Teiid assumes some of the defaults.

This can be fixed by setting the values to what has been delivered as part of metadata. Example here https://github.com/rareddy/sap-demo/blob/master/src/main/java/org/teiid/translator/odata/sap/SAPMetadataProcessor.java#L111-L124