Passing a structure with include into multiline container item

[LANGE, BODO]

 Hi Workflow group,
I am trying to pass a structure with include into a multiline container
item using the swc_set_table but it seems as if there are conversion
errors since the system dumps my date fields (NUMC). It wants them
converted into CHAR-like since the single structure line is a CHAR
string...?!?

Maybe somebody has encountered a similar problem and knows a conversion
rule or FM.

Any hint is appreciated,
Best regards
Bodo