Procedure

• Only the following operations are permitted with date/time:

'date - date' returns an integer
'date - number' returns a date
'time - number' returns a time
'time - time' returns an integer

• The result of any calculation or assignment must be type-compatible
with the operand(s) and may not lead to an overflow, i.e. the resultelement must be large enough when selected.
The following abbreviations are used in the message:
'I': integers (ABAP data type: Int1, Int2, Int4)
'P': packed numbers with decimal places and signs (Dec, Packed)
'N': character string with numerical values (Numc)
'C': character strings (Character)
'D': date
'T': time
'O' or 'o': objects from the Business Object Repository