P0411 Standard Voucher Entry-GL Offest shows blank/due date changed to 90 dyas

Hello,

We are using JDE 9.1.4 , we have found one issue since last few days in standard voucher entry -P0411 , user entering voucher for supplier ABC, all the details like pay terms/G/L Offset already there at supplier master level but some time entry shows in P0411  G/L offset as Blank &  system pick the due date of voucher automatically by exact 90 days!!! &  more interesting thing is that if some one entered three lines for single voucher two lines having correct due date/GL Offset while remaining have due date 90 days with Blank G/L offset.

This is happned randomly not for each voucher.