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This limitation is listed here: http://cwiki.apache.org/confluence/display/ODExSITE/WS-BPEL+2.0+Specification+Compliance#WS-BPEL2.0SpecificationCompliance-Initialization
ODE-1007 Support in-line variable initialization
ODE-915 Add inline variable initialization support - backport of patch from ODE2 codebase