After add in variable pay, basic salary detail all gone

Er... have you noticed that, the Salary column is 0? Please go to Payroll->Salary Adjustment to check again.

Trust me, it won't. You may have done something incorrectly, please check Payroll->Salary Adjustment. Note that for each adjustment, there is a Salary field that you must fill in, you may have forgotten to fill in for some new adjustments.

Sort of. The Salary Adjustment module is used to record the changes in an employee's salary. If you are just editing a wrongly recorded salary, then you do not need to create a new adjustment, simply edit the existing adjustment record.

If there is a change in salary structure, such as salary increment, or addition of new allowance etc, you may want to create a new Salary Adjustment record. In this case, do remember to enter the salary again, even if there is no change to the salary.