The size will be counted as three bytes.
The character P represents a scaling factor for this data item and does not count in the size of the data item.
03 MICROS PIC PPP999.
the data item MICROS can contain values between 0.000001 and 0.000999. The size of the data item is three, and the three zeros between the decimal point and number are not explicitly represented in the number.
Meaning of P: An assumed decimal scaling position. Used to specify the location of an assumed decimal point when the point is not within the number that appears in the data item.
Size Of P: Not counted in the size of the data item. Scaling position characters are counted in determining the maximum number of digit positions in numeric-edited items or in items that are used as arithmetic operands.
The size of the value is the number of digit positions represented by the PICTURE character-string.