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and UnfolPar_2$ contains "NullString", what means that no unfolding of Telitab_2$ is performed.

...

UNION#(Telitab_1$, "LPP", Telitab_2$, "NullString", 0)

it returns:

0 
6 "MODMAT$" "LPP" "B" "T" "MODNO$" 
"1" "wood" 112.30 17.80 7.65 "-999999" 
"2" "foam" 133.80 21.50 9.20 "-999999" 
"3" "wood" 98.60 16.42 6.70 "-999999" 
"4" "plywood" 145.00 22.40 9.40 "-999999" 
"5" "-999999" 112.30 17.80 7.65 5684 
"6" "-999999" 162.70 27.80 11.20 6231 
"7" "-999999" 133.80 21.50 9.20 6301 
"8" "-999999" 118.50 16.70 6.80 6537 
"PROJECTS" 
{ 
1 
"CLIENT$" "YardX" 
} 
{ 
1 
"CLIENT$" "YardX" 
} 
{ 
1 
"CLIENT$" "YardX" 
} 
{ 
1 
"CLIENT$" "YardX" 
} 
{ 
- 
} 
{ 
- 
} 
{ 
- 
} 
{ 
- 
}

...

UNION#(Telitab_1$, "LPP", Telitab_2$, "NullString", 1)

returns:

0 
-6 "1" "2" "3" "4" "5" "6" 
"MODMAT$" "wood" "plywood" "wood" "-999999" "foam" "-999999" 
"LPP" 98.60 145.00 112.30 162.70 133.80 118.50 
"B" 16.42 22.40 17.80 27.80 21.50 16.70 
"T" 6.70 9.40 7.65 11.20 9.20 6.80 
"MODNO$" "-999999" "-999999" 5684 6231 6301 6537 
"PROJECTS" 
{ 
1 
"CLIENT$" "YardX" 
} 
{ 
1 
"CLIENT$" "YardX" 
} 
{ 
1 
"CLIENT$" "YardX" 
} 
{ 
- 
} 
{ 
1 
"CLIENT$" "YardX" 
} 
{ 
- 
}

...