To export to a BACPAC file, the database must be compatible with Azure SQL Database V12. The export will fail if the database is not compatible. With SQL Database V12, there are very few remaining compatibility issues other than server-level and cross-database operations. Databases and applications that rely on partially supported or unsupported functions will need some reengineering to fix these incompatibilities before the SQL Server database can be migrated. Review these partially supported or unsupported functions before migrating the SQL Database.
The tooling to detect and fix these incompatibilities is improving, but it still requires some manual intervention in many cases. The list below describes the tooling as it currently exists, including new tooling coming out in preview mode in May 2016.
The Microsoft SQL Server 2016 Upgrade Advisor preview (UA): This stand-alone tool that currently is in preview will detect and generate a report of SQL Database V12 incompatibilities. This tool does not yet have all of the most recent compatibility rules (but will soon). If no errors are detected, you can continue and complete the migration to SQL Database. If errors are detected, you must use another tool to fix any detected compatibility issues. SSDT is the recommended tool.
As mentioned previously, UA will be updated in late April or early May 2016 and become Data Migration Assistant (DMA). DMA will contain the most recent compatibility rules and will, over time, enable you to fix incompatibilities directly in the tool. This functionality is still coming online, so stay tuned.
SQL Server Data Tools for Visual Studio (SSDT): For Azure SQL Database V12, the best tool today is SSDT because it uses the most recent compatibility rules to detect SQL Database V12 incompatibilities. To use this option, download the newest version of SSDT. If incompatibilities are detected, you can fix detected issues directly in SSDT.
SqlPackage: SqlPackage is a command-prompt utility that tests for and, if found, generates a report containing detected compatibility issues. If you use this tool, make sure you use the most recent version (follow the link provided) to use the most recent compatibility rules. If errors are detected, you must use another tool to fix any detected compatibility issues. SSDT is the recommended tool.
The Export Data-tier Application Wizard in SQL Server Management Studio: This wizard will detect and report errors to the screen. If no errors are detected, you can continue and complete the migration to SQL Database. If errors are detected, you must use another tool to fix any detected compatibility issues. SSDT is the recommended tool.
SQL Azure Migration Wizard (SAMW): For Azure SQL Database V11, the best tool was SAMW. This is a community-supported CodePlex tool that has not been updated fully for Azure SQL Database V12 and generally is not the best method to use to migrate to Azure SQL Database V12.
Source of Information : Migrating SQL Server Databases to Azure
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