ID:19011 Cannot place carry chain starting with node "<name>" due to invalid transitions of chain into and out of shared arithmetic mode

CAUSE: In the current design, a carry chain that starts with the specified node has one or more WYSIWYG LCELL COMB primitives in shared arithmetic mode (that is, the SHARED_ARITH parameter is set to ON for each of these primitives). Because not all the primitives in the carry chain are in shared arithmetic mode, the carry chain transitions into and out of shared arithmetic mode; however, one or more of the carry chain's transitions occur at invalid locations in the carry chain. As a result, the Fitter cannot place the carry chain.

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