Comment 12 for bug 986880

If we suppose_pType->aCreateParams.isEmpty() is useful, here's a naive patch:
diff --git a/dbaccess/source/ui/tabledesign/FieldDescriptions.cxx b/dbaccess/source/ui/tabledesign/FieldDescriptions.cxx
index 65fb772..d3495a8 100644
--- a/dbaccess/source/ui/tabledesign/FieldDescriptions.cxx
+++ b/dbaccess/source/ui/tabledesign/FieldDescriptions.cxx
@@ -221,7 +221,7 @@ void OFieldDescription::FillFromTypeInfo(const TOTypeInfoSP& _pType,bool _bForce
                         SetScale(::std::min<sal_Int32>(GetScale() ? GetScale() : DEFAULT_NUMERIC_SCALE,_pType->nMaximumScale));
                 }
         }
- if ( _pType->aCreateParams.isEmpty() )
+ if ( _pType->aCreateParams.isEmpty() || _bForce )
         {
             SetPrecision(_pType->nPrecision);
             SetScale(_pType->nMinimumScale);

since _bReset seems to deal with SetFormatKey and SetControlDefault, see lines 176..180 of this same file.