Source
SnowConvert AI - General Functional Differences
This message is reported when a Correlated Subquery (subquery that refers to a column from the outer query) is located. This type of subqueries can, in some cases, present some functional differences in Snowflake (Working with Subqueries).
SnowConvert AI - SQL Server-Azure Synapse - System Tables
The sysconstraints compatibility view maps constraint IDs to the objects and tables they belong to. It is a legacy system table from earlier SQL Server versions (SQL Server documentation).