There's your problem
exec dbo.sproc.Infmtx_003_MonthlyAR
That states that the database name is dbo, the schema is sproc and the procedure name is Infmtx_003_MonthlyAR. Since you're getting errors, that's obviously not the case, so specify the correct database and schema names for the procedure
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability