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Problem Note 15310: BACK= option may be reset to zero when doing BY-group processing

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If the value of the BACK= option is greater than the number of observations in a particular BY group, then the BACK= option is reset to zero for that BY group and all subsequent BY groups. The BACK= option should not be reset for the subsequent BY groups. It should only be set to zero for the BY groups that have fewer observations than the BACK= specification.

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Operating System and Release Information

Product FamilyProductSystemSAS Release
ReportedFixed*
SAS SystemSAS High-Performance ForecastingMicrosoft® Windows® for 64-Bit Itanium-based Systems9.1 TS1M39.1 TS1M3 SP3
Microsoft Windows XP Professional9.1 TS1M39.1 TS1M3 SP3
Microsoft Windows Server 2003 Datacenter Edition9.1 TS1M39.1 TS1M3 SP3
Microsoft Windows Server 2003 Enterprise Edition9.1 TS1M39.1 TS1M3 SP3
Microsoft Windows NT Workstation9.1 TS1M39.1 TS1M3 SP3
Microsoft Windows Server 2003 Standard Edition9.1 TS1M39.1 TS1M3 SP3
Microsoft Windows 2000 Professional9.1 TS1M39.1 TS1M3 SP3
Microsoft Windows 2000 Server9.1 TS1M39.1 TS1M3 SP3
Microsoft Windows 2000 Datacenter Server9.1 TS1M39.1 TS1M3 SP3
Microsoft Windows 2000 Advanced Server9.1 TS1M39.1 TS1M3 SP3
64-bit Enabled HP-UX9.1 TS1M39.1 TS1M3 SP3
z/OS9.1 TS1M39.1 TS1M3 SP3
HP-UX IPF9.1 TS1M39.1 TS1M3 SP3
Linux on Itanium9.1 TS1M39.1 TS1M3 SP3
64-bit Enabled Solaris9.1 TS1M39.1 TS1M3 SP3
Linux9.1 TS1M39.1 TS1M3 SP3
OpenVMS Alpha9.1 TS1M39.1 TS1M3 SP3
64-bit Enabled AIX9.1 TS1M39.1 TS1M3 SP3
Tru64 UNIX9.1 TS1M39.1 TS1M3 SP3
* For software releases that are not yet generally available, the Fixed Release is the software release in which the problem is planned to be fixed.