Error while storing Multiple Data into CDT

An error occurred while evaluating expression: =repeat(count(pv!ordersId), pv!invoice.id) (Expression evaluation error at function 'repeat': Cannot repeat list type) (Data Inputs)

so I having many to many relationship names as invoice to ordersId so while mapping data into CDT using repeat function I am getting this above error I want to store 2,1 orderIds  within same invoice 

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