issues with calc's command "find and replace"

I need to transpose lots of data into a new sheet on CALC.
So I generate the relations using the “concatenate” command, e g:

´=IF($dados.$C$4="","",$dados.$C4)

So I copy and paste (special text numbers) to the cells where I need to put my data.
All I have now is a lot of cells with text similar to the text above.

The next step will be to use the command “find and replace” to replace '= by =.
When I perform this command the result is an Error501 and the text was altered as:

=IF($dados.$C$4=)

No matter what I do, I can not perform this task.

I hope someone had faced this same issue and can help me.

Thanks in advance.

Anonymous – did you find an answer to your question? Did mariosv’s answer work for you?

Maybe prior to introduce the first formula, the cell is formatted as text, this is why the formula is putting in the cell as a text not as a formula.