There is a maximum of one Primary Key per table, whereas a table can have several alternate keys. The primary key is usually the type of key that other tables, called child tables, refer to when a foreign key field in those other tables need a relational identifier.
For new tables the default is a primary key based on the RecId field , incremented number or a completely meaningless number that is generated by the system surrogate key.
As The RecId data type, surrogate keys exist on a primary key table. As The RefRecId ETD, surrogate foreign keys exist on a foreign key table (Ex: Party field is on CustTable Table).
Alternate key can be chosen as the Replacement Key of a table that can display on forms instead of a meaningless numeric primary key value. Each table can have a maximum of one replacement key.
Natural key has meaning to people. A set of fields that uniquely identify a record and would have formed the primary key of the table, if not for the existence of a surrogate key.
I got this error at version Dynamics 2012 R3 CU9, SQL Server 2014, Windows Server 2012 R2.
Those kind of errors will come when you move report from Dev Server to Live Server, even compilation in DP Class, Query, Contract, table … without any error
AX1004: Reference System.Core, Version=126.96.36.199, Culture=neutral, PublicKeyToken=b77a5c561934e089 was not a valid model assembly.
MSB3644: The reference assemblies for framework “.NETFramework,Version=v4.0” were not found. To resolve this, install the SDK or Targeting Pack for this framework version or retarget your application to a version of the framework for which you have the SDK
There is no reference Assemblies Version 4.0 under C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework on Windows Server 2012 R2 (only Version 4.5 it have)
Copy those Assemblies from your any where (Windows 7,8,10) to Server