@bbsin
In the context of your formula, your GRnoUpdateInput is prepended with ThisRecord. ThisRecord in your formula refers the the Patch record.
Please consider changing your Formula to the following:
Patch(yourList,
ForAll(
Filter(UpGRNoGal_1.AllItems, IsBlank(GRnoUpdateInput.Text)) As _item,
{ID: _item.ID,
POno: _item.GRnoUpdateInput.Text
}
)
)
Note: ForAll is a table function - it produces a table. It's not a developer For/Loop, so in the above, the table is created and then sent to the Patch function to perform the Patch from the table records.
I hope this is helpful for you.