U2 Toolkit Insert function creating blank multi-values

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I'm seeing some odd behavior in the Insert function. First, the code segment:

AFEMItem.Insert((int)XXX_amcs.ConvData,iPos,sTemp);

By the time this is executed, AFEMItem has several attributes defined.

(int)XXX_amcs.ConvData resolves to 26;
iPos is set to 1;
sTemp has a string value (e.g., 12345.P)

Attribute 26 of AFEMItem is blank before that Insert; after, it contains the value in sTemp followed by a Value Mark and ... well, nothing.

That has the undesirable side effect of looking like an empty value in a MV'd string.

I could add logic that says, in effect, "if the entire attribute is null then Replace, else Insert" - but that seems clunky. Also, that's not how the INSERT functionality works in UniBasic.

Any ideas?

Note: I think I'm using a very recent version of U2 Toolkit for .NET: 1.2.0.1229

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