Modifying background (partially)

[Mr Asta]

Hi from Belgium,

 

 

 

I've a line chart with 24 months (Y axis). Some months are observations and others are forecasts. I want to modify the background for observations in order to quickly view what is the observation period and what is the forecasts period.

 

 

 

I've try to modify the background within the categories section (see below) and / or within the dataset section. The result was the same, nothing happend.

 

 

 

Any idea to solve the problem ?

 

Thank you in advance

 

Dominique

 

 

 

EXEMPLE

 

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