Close and reopen material period ( OMSY, MMPV,MMPI,MMRV,Se16(MARV)  )

1 MMRV to view the current period (or se16 marv)

2 MMPV ,change system material period from current to next current

(Hint: can only change to forward period but backward )

3 how to reopen period backward ? one method is provide here:

Firstly, add a new parameter MMPI_READ_NOTE and set the value to current date

Secondly, using MMPI to initialize material period