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There are several potential problems when transferring a stored procedure from SQL Server to PostgreSQL, including:

1. Syntax Differences: SQL Server and PostgreSQL have different syntax and rules for creating stored procedures. This means that the code for a stored procedure may need to be modified to work in PostgreSQL.

2. Compatibility Issues: Some of the built-in functions in SQL Server may not be available in PostgreSQL, or they may have different names or behaviors. This can cause errors or unexpected results when running a stored procedure in PostgreSQL.

3. Data Type Differences: SQL Server and PostgreSQL support different data types, which can affect the way data is stored and manipulated in a stored procedure. This can cause data conversion issues when transferring a stored procedure from one database to another.

4. Security Considerations: SQL Server and PostgreSQL have different security models, so a stored procedure that may work in SQL Server may not meet the security requirements of PostgreSQL.

Overall, it's important to carefully review and test the stored procedure in both SQL Server and PostgreSQL before transferring it to avoid any potential problems.