Not to able to capture the value of SY-UCOMM correctly

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Hi All,

I have designed a table control which shows me the list of component commodities for a given commodity .

In this screen which contains the table control, the print button at the top of the screen has been enabled.

When I click on the print button, it takes me to an Alv list display screen which gives you a list of component commodities for a given commodity.

When i press /h i.e. get into debugging mode and press back on this screen that contains the alv list display mode,the sy-ucomm field contains the value &f03.

But when it comes to the pbo of the screen from where I gave the print command, the sy-ucomm field value is blank.

When I do a step-by-step debug upto the pbo of the screen from which I gave the print command,I get the sy-ucomm value as &F03,but if I make a direct execution upto the pbo of the screen from which I gave the print command,I get the sy-ucomm field value as blank.

Please could anyone help me out with this and tell me the reason why this is happening.

Regards,

Sushanth H.S.