Installation and Upgrade > Upgrading to the Latest Version of PTC FlexPLM > Upgrade Steps for PTC FlexPLM > Preparing to Upgrade > Using Modeled Sequences
  
Using Modeled Sequences
The com.lcs.wc.db.useModeledSequences=false property is provided for backwards compatibility. Only apply this property to the target system if the source system being upgraded is an Oracle database that previously used non-modeled database sequence objects. Non-modeled sequences are not supported in SQL server databases.
New installations must use modeled sequences. Using the com.lcs.wc.db.useModeledSequences=false property setting on new installations is unsupported and causes an error.