Basic validation on typeofdata questions

[Guido1982]

We have some =typeofdata]documentation concerning the basic validation, but I don't fully understand it.

• What is 'OTH' in the date examples?
• In
  Code:
  

  D~O~OTH~GE~dateinservice~Date in Service
  , are the last two columnname and fieldlabel of the field we are comparing with?