We have recently did fresh install of obiee12c 18.104.22.168 version with cluster setup. And migrated the complete 11g rpd and catalog to it using bimigration utility setup as suggested by Oracle
And when we try to access any Dashboard or page or move one page to other we are facing below error in OBIPS logs. And this issue is intermittent not regular
[2017-05-18T05:41:39Z] [OBIPS] [WARNING:16]  [saw.catalog.impl.saveItemImpl] [ecid: 005Jv_5knL47EC2_Rpt1id0008uF000000,0:13582] [tid: 1653090048] [SI-Name: ] [IDD-Name: ] [IDD-GUID: ] [userId: ] The copy of / trying to be saved is older and stale. Its LastModifiedTime is 2017-5-18 4:39:6 whereas the file on disk now has 2017-5-18 5:41:34. Another process has already updated this file.[[
[2017-05-18T05:41:39Z] [OBIPS] [ERROR:16]  [saw.catalog.serviceinstance.setItemInfo] [ecid: 005Jv_5knL47EC2_Rpt1id0008uF000000,0:13582] [tid: 1653090048] [SI-Name: ] [IDD-Name: ] [IDD-GUID: ] [userId: ] Item Stale: /[[
task: ReCalculate Catalog Size
Also checked both nodes date and time both are in sync and also timing of shared folder is in sync
This issue causing obiee performance and some times page itself not opening completely.