Message "No Objects selected" in planning book

Hello everyone!

I'm facing this message when I load a product in planning book, "No Objects selected"

I could see the product in //MAT1 & in //RRP3, RRP4 views but not in planning book.

I re-initialized the planning area, executed //OM17 & executed /SAPAPO/TS_LCM_CONS_CHECK.

Even after doing this, still the product is not getting loaded in planning book.

What could be the reason, Please help.

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Thanks in Advance!