Writing If conditions....

Hi Experts,

I want to write nested if coniditions to get material description.

My requirement is as below

If Material description exists in EN and if material descritption exists in Z1 language then pick Z1 language material description.

If Material description exists in EN and if material descritption does not exists in Z1 language then pick EN language material description.

Below is the code i have written

<15B1F000(AND:01GT002SPTXT NE "English")>

<11BRG014(G,T:REGION,L,Z;*)>

M02EHS_MATNAMD:Material name> <11ERG014>

<15C1F000><11BRG016(G,T:REGION,L,E;*)>

<02EHS_MATNAMD:Material name> <11ERG016><15EIF000>

but it always showing english description only.

Please help me on this with you code.

Regards,

Rafi