Default: False
Range: True or False

The allow_nulls parameter specifies whether or not the define and redefine commands should set the DAOPT_Nulls_Allowed bit (value 1) in the da_options field of the DATAITEMS client control table. This means that both DMSII null data and data items that contain bad values (excluding keys) will be stored as relational database NULLs.

You can set this parameter in the Client Configuration dialog box of the Client Console or by using data table customization scripts. To avoid storing NULL data as values that are possibly legitimate (0 or 999), keep this parameter set to True.