Get data from select statement in output clause of insert statement

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SQL

I have a Query like below

INSERT INTO iProc.TblContracItemDt
	(
		ClientId, ContractId, ItemId, ItemPkgId, IsOpenCont, OpenBasePrice, IsActive, CreatedBy, CreatedOn, ModifiedBy, ModifiedOn, IsDelete
	) 
	OUTPUT INSERTED.ContItemDtId,INSERTED.ItemId,a.ItemLineNo INTO @ContracItemDtOutput 
	
	SELECT ClientId, @Pid, ItemId, ItemPkgId, IsOpenCont, OpenBasePrice, IsActive, CreatedBy, GETDATE() AS CreatedOn, ModifiedBy, GETDATE() AS ModifiedOn, IsDelete FROM @TVPContracItemDt a

when i executing the following error occur

Msg 4104, Level 16, State 1, Procedure Usp_TblContractInsert, Line 100 [Batch Start Line 7]
The multi-part identifier "a.ItemLineNo" could not be bound.

please help me to solve this

What I have tried:

I have tried to execute the query .

INSERT INTO iProc.TblContracItemDt
	(
		ClientId, ContractId, ItemId, ItemPkgId, IsOpenCont, OpenBasePrice, IsActive, CreatedBy, CreatedOn, ModifiedBy, ModifiedOn, IsDelete
	) 
	OUTPUT INSERTED.ContItemDtId,INSERTED.ItemId,a.ItemLineNo INTO @ContracItemDtOutput 
	
	SELECT ClientId, @Pid, ItemId, ItemPkgId, IsOpenCont, OpenBasePrice, IsActive, CreatedBy, GETDATE() AS CreatedOn, ModifiedBy, GETDATE() AS ModifiedOn, IsDelete FROM @TVPContracItemDt a

but that error shows