Message mapping value in memory

Hello,
I've a source:
field1
field2
field3
field4
and target:
statement1 for field 2 (update_insert)
statement2 for field 3 (update_insert)
statement3 for field 4 (update_insert)
The source is an IDOC.
It's possible have two Statement2 however only have a one field1, this field (field1) is mapping with a field of Statement2 and this produce an error: the second Statement2 hasn't filled the value field1 (because this field only come once - for first Statement2-)
how can i solve this?
thank very much

Hello Pedro,
IDOC (LOIPLO01) -
> Database
segment -
> Statement1 (this only come once)
segment1 -
> Statement2 (this come many times)
segment2 -
> Statement3 (this come many times)
The problem is a field of the Statement2 is having filled with field of segment.
The first time occurrence of Statement2 is ok, but the other times an error occurs because we think the field of segment don't come more and your value is initial in the Statement2
how can we filled this field for second.. Statement2?

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Hello experts,
i was wrong ... my mapping isn't still working. I had created a test instance. and only for this test instance the mapping (see above) works.
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 <E1EDPT1>
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 <E1EDPT2>
 <TDLINE> ... </TDLINE>
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 <E1EDPT2>
 <TDLINE> ... </TDLINE>
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 </E1EDPT1>
</E1EDP01>
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Message mapping value in memory

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