I am not from HR field but have been in Software industry for 8 yrs and worked with multiple employers. I can confirm that whenever they issued me increment letters, reference was always mentioned on it. Moreover, any documentation relating to remuneration had an annexure attached to it that detailed about salary break-up.
17th January 2016 From India, Mumbai
Your second query, If the salary structures are changed, then only you are required to mention all the details whatever is payable to the employee. If you are giving the increment in the basic salary, you can mention that your basic salary is increased and fixed at Rs.xxx and other allowance are remained same as the other allowance calculations are interlinked with basic salary.
Labour Laws Consultant
22nd January 2016 From India, Bidar
Every file must contain Ref.No.like TSP/HRA/SK/105 where TSP means name of Co., HRA is the Dept., & SK is the HR Manager Shivakumar.followed by the Index No.of File. This helps the Staff to retrieve the files fast and these are well laid procedures for File Maintenance.
Reg. splitting gross salary after increment, Seniors have rightly commented.
24th January 2016 From India, Mumbai