Is it really necessary to Upgrade from Oracle EBS R11i to R12?

Hi,
Oracle Applications 11.0.3 (Oracle Financials) was implemented in our company and later in 2006 it was upgraded to 11.5.10 (with new implementation of Supply Chain Management Module - INV,OM and PO) and 2 months ago we upgraded it to 11.5.10.2+DB 11gR2.
I've been recommending to upgrade to R12 but the Finance Users are reluctant for an upgrade and of the opinion that the R12 has many bugs and there will be issues after upgrade to R12.
Once of the consultant is of the opinion that its better to re-implement R12 instead of Upgrade. He also tells me that R12 does not have sub-accounting and sub-ledger and trial balance reports in AP.Since I am not a Functional Consultant I could not comment on this.
Please advice if there are any useful docs which address the upgrade to R12 issues which I can share with our consultant and users.
I am currently going thru +Upgrade Advisor: Oracle E-Business Suite Financials and Projects Upgrade from 11.5.10.2 to 12.1.3 and 12.1.2 [ID 256.1]+
Rgds,
Thiru

user1983888 wrote:
Hi,
Oracle Applications 11.0.3 (Oracle Financials) was implemented in our company and later in 2006 it was upgraded to 11.5.10 (with new implementation of Supply Chain Management Module - INV,OM and PO) and 2 months ago we upgraded it to 11.5.10.2+DB 11gR2.
I've been recommending to upgrade to R12 but the Finance Users are reluctant for an upgrade and of the opinion that the R12 has many bugs and there will be issues after upgrade to R12.
R12.1.x is a stable release that many customers (including Oracle themselves) have upgraded to.
Once of the consultant is of the opinion that its better to re-implement R12 instead of Upgrade. He also tells me that R12 does not have sub-accounting and sub-ledger and trial balance reports in AP.Since I am not a Functional Consultant I could not comment on this.
The Finance modules have been completely re-written and fucntionality had changed for the better. Re-implementation typically costs upto 3 times more than a upgrade. Re-implementation is not necessary if the business model and process have not changed. What are the consultants justifications for doing a re-implementation (other than making more money) ?
Please advice if there are any useful docs which address the upgrade to R12 issues which I can share with our consultant and users.
I am currently going thru +Upgrade Advisor: Oracle E-Business Suite Financials and Projects Upgrade from 11.5.10.2 to 12.1.3 and 12.1.2 [ID 256.1]+
Pl see the Docs referenced in MOS Doc 850008.1 (Interesting Documents Concerning E-Business Suite 11i to R12 Upgrades)
Rgds,
ThiruHTH
Srini

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=======================================
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End output from spawned process.
Exception thrown from action: make
Exception Name: MakefileException
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Exception Severity: 1
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====================================================================================
content of /data/oracle/db/proddb/9.2.0/install/make.log*
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=====================================================================================================
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Edited by: IndiaDBA on २१ नवंबर, २०१२ १:२० अपराह्न

IndiaDBA wrote:
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