Reports: After migration of REPORT getting errors about reference accuracy

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Hi all

We are in the FR reporting migration process to REPORTS within FCCS.

We have come across these errors:

Rows xxxx on Grid1 have a reference to a member xxxx in dimensions Account this is inaccurate. There are multiple members found with that member name in data source xxxx. For more clarity, you must re-select the member using the member selection dialog box

It seems these errors refer to parent and child displaying with brackets. I tried to check if there was a sub-variables issue but I cannot see it.